What is the easiest way to import a text matrix into Matlab?

HI,

I exported a symbolic matrix from Maple as a text file, and now want to import it to Matlab.

What is the easiest way to import it to Matlab?

Is there any special ready to use function to read it and put in a matrix?

Here I have put two line of that text file, which each line represents each raw of the (2*6) matrix.

x*y*z 1/2*tau[2] sin(x*y*z) ln(x*y*z) tau*exp(x*y*z) sin(x+y)+cos(x+y)

x^2+1 x^2+1/sin(x*y*z) 2*exp(y) tau diff(f(x,y,z),x) int(f(x,y,z),x)

Answer 1

[Walter Roberson]

readcell(FileNameGoesHere, 'delimiter', '\t')

or

readtable(FileNameGoesHere, 'delimiter', '\t', 'readvariablenames', false)

Question:

Have you considered using Maple's CodeGeneration[Matlab] function ?

[Mehdi]

It worked by putting the name between "". Then converting to cell to matrix, faced error

>>A= readcell("ma.txt", 'delimiter', '\t')

A =

2×6 cell array

{'x*y*z'} {'1/2*tau[2]' } {'sin(x*y*z)'} {'ln(x*y*z)'} {'tau[1]*exp(x*y*z)'} {'sin(x+y)+cos(x+y)'}

{'x^2+1'} {'x^2+1/sin(x*y*z)'} {'2*exp(y)' } {'tau[1]' } {'diff(f(x,y,z),x)' } {'int(f(x,y,z),x)' }

>> B=cell2mat(A)

Error using cat

Dimensions of arrays being concatenated are not consistent.

Error in cell2mat (line 78)

m = cat(1,m{:});

Have you considered using Maple's CodeGeneration[Matlab] function ?

yes, since my matrix has some variables such as x[1], y[8], ... this command faced error. Also this function creates codes only, not m file. I have to copy and paste them manually which for big matrices is not a good idea.

[Walter Roberson]

You can ask Maple to write to file

https://www.maplesoft.com/support/help/maple/view.aspx?path=save

https://www.maplesoft.com/support/help/maple/view.aspx?path=FileTools%2FText%2FWriteString

[Walter Roberson]

B=cell2mat(A)

What are you hoping that the output of that command would give you?

[Mehdi]

Maple face error: Error, (in codegen/makeproc) optional arguments must be equations [x[1], x[2]]

No way to change the cell to matrix?

[Walter Roberson]

What datetype were you hoping for the array. What size() were you hoping for the array?

[Mehdi]

I am looking for 2*6 symbolic matrix exactly similar to what was at Maple.

[x*y*z, 1/2*tau, sin(x*y*z), ln(x*y*z), tau*exp(x*y*z), sin(x+y)+cos(x+y);

x^2+1, x^2+1/sin(x*y*z), 2*exp(y), tau, diff(f(x,y,z),x), int(f(x,y,z),x)];

[Walter Roberson]

You would need to use str2sym() to convert the entries to symbolic.

However, your input includes '1/2*tau[2]' which is not valid MATLAB symbolic expression.

It also includes ln(x*y*z) -- remember that the MATLAB log is log() not ln()