[Scilab-users] slash (/) help page confusing ?

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Philippe Roux Philippe Roux
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[Scilab-users] slash (/) help page confusing ?

Hi

before scilab6 there was some ambiguity between 1/B=1./B=(1.)/B  since
1. = 1 for floating point real numbers. We can see that this problem is
solved now :


--> B=1:3
 B  =

   1.   2.   3.


--> 1./B
 ans  =

   1.   0.5   0.3333333


--> 1/B
 ans  =

   0.0714286
   0.1428571
   0.2142857

but in the help page it is written that "X=A/B is the solution of X*B=A"
this false for  A=1  and B=1:3  as you can see :


--> B*(1/B)  // =1 !!!!
 ans  =

   1.


--> (1/B)*B  //  should be 1 ?
 ans  =

   0.0714286   0.1428571   0.2142857
   0.1428571   0.2857143   0.4285714
   0.2142857   0.4285714   0.6428571

but this is true for general matrix

--> A=[1 2 ; 3 4]
 A  =

   1.   2.
   3.   4.


--> B=[4 5 ; 6 7]
 B  =

   4.   5.
   6.   7.


--> B*(A/B) // sould be A ?
 ans  =

   17.5  -8.5
   25.5  -12.5


--> (A/B)*B // =A
 ans  =

   1.   2.
   3.   4.


this looks confusing ?

Best regards,
Philippe

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Re: slash (/) help page confusing ?

Le 30/08/2018 à 09:32, philippe a écrit :

> Hi
>
> before scilab6 there was some ambiguity between 1/B=1./B=(1.)/B  since
> 1. = 1 for floating point real numbers. We can see that this problem is
> solved now :
>
>
> --> B=1:3
>   B  =
>
>     1.   2.   3.
>
>
> --> 1./B
>   ans  =
>
>     1.   0.5   0.3333333
>
>
> --> 1/B
>   ans  =
>
>     0.0714286
>     0.1428571
>     0.2142857
>
> but in the help page it is written that "X=A/B is the solution of X*B=A"
> this false for  A=1  and B=1:3  as you can see :
>
>
> --> B*(1/B)  // =1 !!!!
>   ans  =
>
>     1.
>
>
> --> (1/B)*B  //  should be 1 ?
>   ans  =
>
>     0.0714286   0.1428571   0.2142857
>     0.1428571   0.2857143   0.4285714
>     0.2142857   0.4285714   0.6428571
>
> but this is true for general matrix
>
> --> A=[1 2 ; 3 4]
>   A  =
>
>     1.   2.
>     3.   4.
>
>
> --> B=[4 5 ; 6 7]
>   B  =
>
>     4.   5.
>     6.   7.
>
>
> --> B*(A/B) // sould be A ?
>   ans  =
>
>     17.5  -8.5
>     25.5  -12.5
>
>
> --> (A/B)*B // =A
>   ans  =
>
>     1.   2.
>     3.   4.
>
>
> this looks confusing ?
No.

For square A, B, invertible B, "A/B" means "A*inv(B)", hence
B*(A/B)=B*A*inv(B) cannot be equal to A (matrix product is not commutative)

S.
>
> Best regards,
> Philippe
>
> _______________________________________________
> users mailing list
> [hidden email]
> https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users


--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet

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Re: slash (/) help page confusing ?

Le 30/08/2018 à 09:42, Stéphane Mottelet a écrit :
> Le 30/08/2018 à 09:32, philippe a écrit :
>>  
>> [...]
>> but in the help page it is written that "X=A/B is the solution of X*B=A"
>
>
> For square A, B, invertible B, "A/B" means "A*inv(B)", hence
> B*(A/B)=B*A*inv(B) cannot be equal to A (matrix product is not commutative)

I know this but for non-square matrices scilab use the opposite
convention, IMHO it's confusing, and the case of a scalar in the help
page doesn't mention this change. the help page should be updated.

Best regards,

Philippe

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Re: slash (/) help page confusing ?

Le 30/08/2018 à 10:03, philippe a écrit :

> Le 30/08/2018 à 09:42, Stéphane Mottelet a écrit :
>> Le 30/08/2018 à 09:32, philippe a écrit :
>>>  
>>> [...]
>>> but in the help page it is written that "X=A/B is the solution of X*B=A"
>>
>> For square A, B, invertible B, "A/B" means "A*inv(B)", hence
>> B*(A/B)=B*A*inv(B) cannot be equal to A (matrix product is not commutative)
> I know this but for non-square matrices scilab use the opposite
> convention,
OK. To me, the / operator does not correctly check the compatibility of
respective dimensions of A and B. The statements:

A=1;
B=[1 2 3];
X=A/B

should raise an error because A and B must have the same number of
columns if the equality X*B=A has to make sense.

With the following statements

A=1;
B=[1 2 3]';
X=A/B
X*B

we get a coherent result:

--> X=A/B
  X  =

    0.   0.   0.3333333

--> X*B
  ans  =

    1.

S.

> IMHO it's confusing, and the case of a scalar in the help
> page doesn't mention this change. the help page should be updated.
>
> Best regards,
>
> Philippe
>
> _______________________________________________
> users mailing list
> [hidden email]
> https://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users


--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet

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Re: slash (/) help page confusing ?

Le 30/08/2018 à 10:22, Stéphane Mottelet a écrit :

> Le 30/08/2018 à 10:03, philippe a écrit :
>> Le 30/08/2018 à 09:42, Stéphane Mottelet a écrit :
>>> Le 30/08/2018 à 09:32, philippe a écrit :
>>>>   [...]
>>>> but in the help page it is written that "X=A/B is the solution of
>>>> X*B=A"
>>>
>>> For square A, B, invertible B, "A/B" means "A*inv(B)", hence
>>> B*(A/B)=B*A*inv(B) cannot be equal to A (matrix product is not
>>> commutative)
>> I know this but for non-square matrices scilab use the opposite
>> convention,
> OK. To me, the / operator does not correctly check the compatibility
> of respective dimensions of A and B. The statements:
>
> A=1;
> B=[1 2 3];
> X=A/B
>
> should raise an error because A and B must have the same number of
> columns if the equality X*B=A has to make sense.
>
> With the following statements
>
> A=1;
> B=[1 2 3]';
> X=A/B
> X*B
>
> we get a coherent result:
>
> --> X=A/B
>  X  =
>
>    0.   0.   0.3333333
>
> --> X*B
>  ans  =
>
>    1.
>
> S.
in Matlab, dimensions are correctly checked:

 >> 1/[1 2 3]
Error using  /
Matrix dimensions must agree.

Bug created @ http://bugzilla.scilab.org/show_bug.cgi?id=15746

S.

>> IMHO it's confusing, and the case of a scalar in the help
>> page doesn't mention this change. the help page should be updated.
>>
>> Best regards,
>>
>> Philippe
>>
>> _______________________________________________
>> users mailing list
>> [hidden email]
>> https://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users 
>>
>
>

--
Stéphane Mottelet
Ingénieur de recherche
EA 4297 Transformations Intégrées de la Matière Renouvelable
Département Génie des Procédés Industriels
Sorbonne Universités - Université de Technologie de Compiègne
CS 60319, 60203 Compiègne cedex
Tel : +33(0)344234688
http://www.utc.fr/~mottelet

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Re: slash (/) help page confusing ?

Le 30/08/2018 à 10:34, Stéphane Mottelet a écrit :
> in Matlab, dimensions are correctly checked:
>
>>> 1/[1 2 3]
> Error using  /
> Matrix dimensions must agree.
>
> Bug created @ http://bugzilla.scilab.org/show_bug.cgi?id=15746

this looks more coherent !

For a column vector A the behavior of 1/A 1./A is now coherent.

Philippe

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[Scilab-users] Any chance SciLab 6 operational again under macOS 10.14?

  System Version: macOS 10.14 (18A377a)
  Kernel Version: Darwin 18.0.0
Darwin Kernel Version 18.0.0: Wed Aug 22 20:59:21 PDT 2018; root:xnu-4903.201.2~4/RELEASE_X86_64 x86_64
Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any chance SciLab 6 operational again under macOS 10.14?
Heinz
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Re: Any chance SciLab 6 operational again under macOS 10.14?

Heinz Nabielek <[hidden email]> a écrit :

System Version:        macOS 10.14 (18A377a)
Kernel Version:        Darwin 18.0.0
Darwin Kernel Version 18.0.0: Wed Aug 22 20:59:21 PDT 2018; root:xnu-4903.201.2~4/RELEASE_X86_64 x86_64
Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any chance SciLab 6 operational again under macOS 10.14?
Heinz
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Hello,

Tonight I installed the latest Mojave beta on a second partition of my Mac Book disk and were able to run Scilab. Here is how I proceeded:

1-The OS has been installed on a new partition without any old data import
2-I installed the command line tools (open a Terminal the type "make" to trigger the download/install)
3-Downloaded the official 6.0.1 for OSX from scilab.org and move the app in /Applications
4-Deleted some libraries bundled by Scilab:

$  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libBLAS.dylib
$  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libz.*

5-Commented out the line 
 774 in /Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab

 

                    #fail_macosx_version

6-Launched Scilab from its icon. At first run, you will be asked to install Java 1.6

See the attached screenshot.

S.



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Re: Any chance SciLab 6 operational again under macOS 10.14?

[hidden email] a écrit :

Heinz Nabielek <[hidden email]> a écrit :

System Version:        macOS 10.14 (18A377a)
Kernel Version:        Darwin 18.0.0
Darwin Kernel Version 18.0.0: Wed Aug 22 20:59:21 PDT 2018; root:xnu-4903.201.2~4/RELEASE_X86_64 x86_64
Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any chance SciLab 6 operational again under macOS 10.14?
Heinz
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[hidden email].<a href="orghttps://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users" target="_blank">orghttps://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users


Hello,

Tonight I installed the latest Mojave beta on a second partition of my Mac Book disk and were able to run Scilab. Here is how I proceeded:

1-The OS has been installed on a new partition without any old data import
2-I installed the command line tools (open a Terminal the type "make" to trigger the download/install)
3-Downloaded the official 6.0.1 for OSX from scilab.org and move the app in /Applications
4-Deleted some libraries bundled by Scilab:

$  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libBLAS.dylib
$  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libz.*

5-Commented out the line 
 774 in /Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab

 

                    #fail_macosx_version
 

6-Launched Scilab from its icon. At first run, you will be asked to install Java 1.6

See the attached screenshot.

S.

 


I forgot to say something in step 5. Change Line 803 as follows (add 14, the OSX minor version number)

                10|11|12|13|14)

S.

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Re: Any chance SciLab 6 operational again under macOS 10.14?

I have the Scilab 6.0.1 icon in the dock, but still does not startup. Java 1.6 also a problem, because "newer version is already installed".

From the command line, I get the messages as below...

/Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab -nw

dyld: Symbol not found: _double_general_add
  Referenced from: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
  Expected in: /libBLAS.dylib
 in /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
/Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab: line 972:  1137 Abort trap: 6           "$SCILABBIN" "$@"

> On 30.08.2018, at 21:48, [hidden email] wrote:
>
> [hidden email] a écrit :
>
>> Heinz Nabielek <[hidden email]> a écrit :
>>
>>> System Version:        macOS 10.14 (18A377a)
>>> Kernel Version:        Darwin 18.0.0
>>> Darwin Kernel Version 18.0.0: Wed Aug 22 20:59:21 PDT 2018; root:xnu-4903.201.2~4/RELEASE_X86_64 x86_64
>>> Apple LLVM version 9.1.0 (clang-902.0.39.2)
>>> Target: x86_64-apple-darwin18.0.0
>>> Thread model: posix
>>> InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
>>>
>>> Any chance SciLab 6 operational again under macOS 10.14?
>>> Heinz
>>> _______________________________________________
>>> users mailing list
>>> [hidden email]://antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users
>>>
>>
>> Hello,
>>
>> Tonight I installed the latest Mojave beta on a second partition of my Mac Book disk and were able to run Scilab. Here is how I proceeded:
>>
>> 1-The OS has been installed on a new partition without any old data import
>> 2-I installed the command line tools (open a Terminal the type "make" to trigger the download/install)
>> 3-Downloaded the official 6.0.1 for OSX from scilab.org and move the app in /Applications
>> 4-Deleted some libraries bundled by Scilab:
>>
>> $  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libBLAS.dylib
>> $  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libz.*
>>
>> 5-Commented out the line  774 in /Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab
>>
>>  
>>                     #fail_macosx_version
>>  
>>
>> 6-Launched Scilab from its icon. At first run, you will be asked to install Java 1.6
>>
>> See the attached screenshot.
>>
>> S.
>>  
>
> I forgot to say something in step 5. Change Line 803 as follows (add 14, the OSX minor version number)
>
>                 10|11|12|13|14)
>
> S.
> _______________________________________________
> users mailing list
> [hidden email]
> http://lists.scilab.org/mailman/listinfo/users

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Re: Any chance SciLab 6 operational again under macOS 10.14?

Hello,

It seems that you still have a libBLAS.dylib file in /

Please confirm that with a

$ ls -l /

If confirmed, delete this file.

S.


Heinz Nabielek <[hidden email]> a écrit :

I have the Scilab 6.0.1 icon in the dock, but still does not startup. Java 1.6 also a problem, because "newer version is already installed".

From the command line, I get the messages as below...

/Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab -nw

dyld: Symbol not found: _double_general_add
Referenced from: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
Expected in: /libBLAS.dylib
in /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
/Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab: line 972:  1137 Abort trap: 6           "$SCILABBIN" "$@"

On 30.08.2018, at 21:48, [hidden email] wrote:

[hidden email] a écrit :

Heinz Nabielek <[hidden email]> a écrit :

System Version:        macOS 10.14 (18A377a)
Kernel Version:        Darwin 18.0.0
Darwin Kernel Version 18.0.0: Wed Aug 22 20:59:21 PDT 2018; root:xnu-4903.201.2~4/RELEASE_X86_64 x86_64
Apple LLVM version 9.1.0 (clang-902.0.39.2)
Target: x86_64-apple-darwin18.0.0
Thread model: posix
InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin

Any chance SciLab 6 operational again under macOS 10.14?
Heinz
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users mailing list
[hidden email].<a href="orghttps://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users" target="_blank">orghttps://antispam.utc.fr/proxy/2/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/antispam.utc.fr/proxy/1/c3RlcGhhbmUubW90dGVsZXRAdXRjLmZy/lists.scilab.org/mailman/listinfo/users

Hello,

Tonight I installed the latest Mojave beta on a second partition of my Mac Book disk and were able to run Scilab. Here is how I proceeded:

1-The OS has been installed on a new partition without any old data import
2-I installed the command line tools (open a Terminal the type "make" to trigger the download/install)
3-Downloaded the official 6.0.1 for OSX from scilab.org and move the app in /Applications
4-Deleted some libraries bundled by Scilab:

$  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libBLAS.dylib
$  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libz.*

5-Commented out the line  774 in /Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab


                    #fail_macosx_version


6-Launched Scilab from its icon. At first run, you will be asked to install Java 1.6

See the attached screenshot.

S.
I forgot to say something in step 5. Change Line 803 as follows (add 14, the OSX minor version number)

                10|11|12|13|14)

S.
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Re: Any chance SciLab 6 operational again under macOS 10.14?

Grandiose Stéphane: everything working and sorry for being clumsy for a while.....Heinz

--> [version, opts] = getversion()
 opts  = !GCC  x64  modelicac  release  Feb 15 2018  15:42:45  !

 version  =  scilab-6.0.1

> On 31.08.2018, at 08:23, [hidden email] wrote:
>
> Hello,
>
> It seems that you still have a libBLAS.dylib file in /
>
> Please confirm that with a
>
> $ ls -l /
>
> If confirmed, delete this file.
>
> S.
>
>
> Heinz Nabielek <[hidden email]> a écrit :
>
>> I have the Scilab 6.0.1 icon in the dock, but still does not startup. Java 1.6 also a problem, because "newer version is already installed".
>>
>> From the command line, I get the messages as below...
>>
>> /Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab -nw
>>
>> dyld: Symbol not found: _double_general_add
>> Referenced from: /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
>> Expected in: /libBLAS.dylib
>> in /System/Library/Frameworks/Accelerate.framework/Versions/A/Frameworks/vecLib.framework/Versions/A/libLinearAlgebra.dylib
>> /Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab: line 972:  1137 Abort trap: 6           "$SCILABBIN" "$@"
>>
>>> On 30.08.2018, at 21:48, [hidden email] wrote:
>>>
>>> [hidden email] a écrit :
>>>
>>>> Heinz Nabielek <[hidden email]> a écrit :
>>>>
>>>>> System Version:        macOS 10.14 (18A377a)
>>>>> Kernel Version:        Darwin 18.0.0
>>>>> Darwin Kernel Version 18.0.0: Wed Aug 22 20:59:21 PDT 2018; root:xnu-4903.201.2~4/RELEASE_X86_64 x86_64
>>>>> Apple LLVM version 9.1.0 (clang-902.0.39.2)
>>>>> Target: x86_64-apple-darwin18.0.0
>>>>> Thread model: posix
>>>>> InstalledDir: /Applications/Xcode.app/Contents/Developer/Toolchains/XcodeDefault.xctoolchain/usr/bin
>>>>>
>>>>> Any chance SciLab 6 operational again under macOS 10.14?
>>>>> Heinz
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>>>>>
>>>> Hello,
>>>>
>>>> Tonight I installed the latest Mojave beta on a second partition of my Mac Book disk and were able to run Scilab. Here is how I proceeded:
>>>>
>>>> 1-The OS has been installed on a new partition without any old data import
>>>> 2-I installed the command line tools (open a Terminal the type "make" to trigger the download/install)
>>>> 3-Downloaded the official 6.0.1 for OSX from scilab.org and move the app in /Applications
>>>> 4-Deleted some libraries bundled by Scilab:
>>>>
>>>> $  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libBLAS.dylib
>>>> $  rm /Applications/scilab-6.0.1.app/Contents/MacOS/lib/thirdparty/libz.*
>>>>
>>>> 5-Commented out the line  774 in /Applications/scilab-6.0.1.app/Contents/MacOS/bin/scilab
>>>>
>>>>
>>>>                     #fail_macosx_version
>>>>
>>>>
>>>> 6-Launched Scilab from its icon. At first run, you will be asked to install Java 1.6
>>>>
>>>> See the attached screenshot.
>>>>
>>>> S.
>>> I forgot to say something in step 5. Change Line 803 as follows (add 14, the OSX minor version number)
>>>
>>>                 10|11|12|13|14)
>>>
>>> S.
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