MaplePrimes - answers and comments on Question, Matlab-Maple interface

evalM

pagan — Sat, 04 Jun 2011 05:08:45 Z

You should be able to use Maple's evalM command for this. (note the mixed capitalization of that command.)

The expressions in Matlab syntax that evalM supports includes function calls. You can even call it several times back-to-back in order to set the working directory, assign variables, then call a matlab function with them, etc. (You might have to set the working directory in order for matlab to pick up some function you might have in a .m file, etc.)

Here's someone doing all that.

Maple Toolbox for Matlab

Paul — Mon, 06 Jun 2011 19:32:04 Z

The evalM command is for calling Matlab commands from Maple. I think Subhra is looking for the reverse direction -- calling Maple commands from within Matlab. This can be done using the Maple Toolbox for Matlab (MTM).

When you first installed Maple it may have asked you about a path to Matlab in order to set up MTM. If you have the directory $MATLAB/toolbox/maple (where $MATLAB is the path to your Matlab install), then you likely have everything all ready to go. Otherwise, run "MapleToolbox.bat", or similar platform specific install script sitting in your root Maple program directory.

The documentation for this toolbox is all inside Matlab. Reference it by typing the following at the Matlab command prompt:

>> doc maple

There are many commands to seamlessly call into maple to do computations using Matlab syntax. There is also a general command called "maple", which will accept arbitrary Maple expressions. For example:

>> x = sym('x');
>> x^3+cos(2*x)-1

 ans =
          3
         x   + cos(2 x) - 1
>> diff(x^3)
 
 ans =
                   2
               3 x
>> maple('int',ans,'x')
 
 ans =
                   3
                  x
>> maple('evalf(Pi,10)')

 ans =
            3.141592654

The commands above are all typed at a Matlab prompt. sym declares a variable as a Maple expression, which you can then use with various commands like "diff", that are part of MTM (and call directly through to Maple's diff command). The first use of the maple command shows how to pass arguments computed in Matlab. The second use shows a self contained Maple expression.

Maple Toolbox for Matlab

Subhra — Tue, 17 Jul 2012 02:32:35 Z

Thanks Paul ! that really clarifies my doubt.

Subhra — Sun, 10 Jun 2012 06:55:37 Z

Thanks Paul ! that really clarifies my doubt. Yea I don't have the toolbox installed. I need to install it.

Hello Paul,Thanks for your reply. I have

Subhra — Tue, 17 Jul 2012 02:44:11 Z

Hello Paul,

Thanks for your reply. I have now installed Maple 16 which provided Maple Toolbox for Matlab. So now I can execute the commands you had specified before in matlab command window. However when I define a maple procedure as .mw file and try to read it from Matlan command window, I am getting following error:

procread('fndRoot.mw');

--where "fndRoot" is the name of my procedure and it is saved as .mw file. then i get following error msg:
^
??? Error using ==> maplemex
Error, while reading `C:\Program Files\MATLAB\R2011a\toolbox\maple\fndRoot.mw`
Error in ==> procread at 45
maplemex('0MTM:-procread',a);


Could you kindly help me out with this?

Thanks
Subhra

@Subhra procread works with .mpl files

Paul — Tue, 17 Jul 2012 17:47:55 Z

@Subhra

procread works with .mpl files -- plain text files of Maple commands. The .mw file in your example is not a plain text file. To turn it into one, load it up in Maple's gui, and select File->Export. Choose "Maple Input (.mpl)" as the export format in the file type drop down and click Save. Inspect the saved file in a plain text editor like notepad. You will see the same commands listed as in your worksheet, but output regions will be put into comments. This file can be run in Maple using the "read" command. It is also now suitable for use with "procread" in Matlab.