loading an m.file with a series of matrices

Hi there, I want to load the file (WA1.m) which already contains a couple of matrices I copied from an excel-Database. The matrices are as follows: Section_1, Section_2, Section_3 and so on. Every matrix contains 2 columns. The matrices have different number of rows.

Loading the file can be simply done as follows: load WA1.m

My problem is that I can not call these matrices within a for-loop.

I also want to use the matrix number as a counter: like i=1 for Section_1 and so on.

I read about evalin and eval but could not figure that out by myself.

Thanks in advance.

Answer 1

[Andrei Bobrov]

better using cell arrays ( C ) for submission matrices

d = who;
d2 = strcat(d(strncmp(d,'Section',7)),',');
C = eval(['{',[d2{:}],'}']);

OR

eg

n = 3; 
K = arrayfun(@(ii)randi(50,randi(10),2),1:n,'un',0);
eval( ['['  sprintf('Section_%-d,',1:n)  ,'] = K{:}']   );

C = eval(['{',sprintf('Section_%-d,',1:3),'}'])

Answer 2

[Walter Roberson]

http://matlab.wikia.com/wiki/FAQ#How_can_I_create_variables_A1.2C_A2.2C....2CA10_in_a_loop.3F

Answer 3

[Dima]

Hey there, thank you very much. The problem could be solved likt this, I asked some kolleges about it:

x=evalin('base',['Section_' num2str(jj)]); nameSection=['Section_' num2str(jj)]; assignin ('base', nameSection, x);

Have a nice day Dima

[Walter Roberson]

Please do not use that approach. Instead of using

load WA1.m

use

Sections = load('WA1.m');

Then your matrices become fields of the structure Sections, and you can use dynamic field names, such as

fn = sprintf('Section_%d', 5);

Sections.(fn)