Build a matrix from saved arrays with differents lengths

Question

Daniel 2012-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/26861-build-a-matrix-from-saved-arrays-with-differents-lengths

Hi to all!

I'm working on a simulation program. Each time the programs ends a simulation it saves the data (an array sized of 1 row and multiple columns) to a single .mat file: 'rf_ln1.mat'

For each simulation array size can change.

So, now: How can I construct a matrix from this saved different sized arrays? Because I don't know the size of each saved line unless I load them.

For example: rf_ln1.mat, rf_ln2.mat... rf_ln129.mat M = [rf_ln1.mat rf_ln2.mat ... rf_ln129.mat];

1. Is there an easy way such as using a struc or cell or a function? 2. Any tips? Ideas? Has someone already done this?

I would do: load file save it into a struc or cell (o create a variable with the name) seach the biggest one create a zero matrix sized (1,biggestone) create for each array a new one with the max size of all arrays insert it in the zero matrix

Any ideas with no so much steps?

Thanks for your answers! :)

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Answer 1

Walter Roberson 2012-1-23

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https://ww2.mathworks.cn/matlabcentral/answers/26861-build-a-matrix-from-saved-arrays-with-differents-lengths#answer_34980

You can use whos() with the -file option in order to find the matrix sizes without loading the files.

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Daniel 2012-1-23

Is there a form to get in a variable the size of rfline_post (in this case)?

>> whos -file rf_data/rf_post_ln1.mat

Name Size Bytes Class Attributes

rfline_post 18173x1 145384 double

tline_post 1x1 8 double

Walter Roberson 2012-1-23

http://www.mathworks.com/help/techdoc/ref/whos.html

s = whos('rfline_post', '-file', 'rf_data/rf_post_In1.mat');

s.size

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Answer 2

Daniel 2012-1-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/26861-build-a-matrix-from-saved-arrays-with-differents-lengths#answer_35054

在 MATLAB Online 中打开

Hi,

Here is how i have done it. Thanks Walter! :)

lineLengths = [];
for i=1:no_lines
    fileName = ['rf_data/rfline_pre_' num2str(i) '.mat'];
    s_pre = whos('rfline_pre', '-file',fileName );
    lineLengths_pre=[lineLengths s_pre.size];
      fileName = ['rf_data/rfline_post_' num2str(i) '.mat'];
      s_post = whos('rfline_post', '-file',fileName );
      lineLengths_post=[lineLengths s_post.size];
  end
maxLength_pre = max(lineLengths_pre);
maxLength_post = max(lineLengths_post);
rfAllLines_pre = zeros(maxLength_pre,no_lines);
rfAllLines_post = zeros(maxLength_post,no_lines);
tlineAll_pre = [];
tlineAll_post = [];
for i=1:no_lines
   fileName = ['rf_data/rfline_pre_' num2str(i) '.mat'];
   cmd = ['load ', fileName];
   eval(cmd);
   rfAllLines_pre(1:max(size(rfline_pre)),i)=rfline_pre;
   tlineAll_pre = [tlineAll_pre tline_pre];
     fileName = ['rf_data/rfline_post_' num2str(i) '.mat'];
     cmd = ['load ', fileName];
     eval(cmd);
     rfAllLines_post(1:max(size(rfline_post)),i)=rfline_post;
     tlineAll_post = [tlineAll_post tline_post];
  end