CODEWITHSUNDEEP
matlabdynamicautomation
user2273202
user2273202

Reputation:

How to assign iteration number to a matlab variable during iteration

As an intermediate step to analysis I need to populate a variable called 'files' with the index of current iteration. So far I am doing it manually. I wouldn't like to do it manually for i=1:1000 so I am looking for some automation here, I experimented with many functions but nothing is working. Please help.

Thanks.

Given below is the code snipped I am running.

clear; clc;
    for i=1:10
    files{i}.data = {
        {
        ['1.csv']
        ['2.csv']
        ['3.csv']
        ['4.csv']
        ['5.csv']
        ['6.csv']
        ['7.csv']
        ['8.csv']
        ['9.csv']
        ['10.csv']
        }};
    end

Required structure of file variable Required structure of data variable

Update:

I am using this script

clear; clc;
wdir = 'path\';
all_files = 10;
for i=1:10
files{i}.data = {
    {
        cellstr(strcat(wdir,num2str((1:all_files).'),'.csv'))
    }};
end

Everything is good about this script except the string concat function, It generates space between path and file number for 1..9 files and file no. 10 is perfect. Please help me to fix this. I am getting something like this. WHy this whitespace

Upvotes: 1

Views: 171

Answers (3)

Lujun.Z
Lujun.Z

Reputation: 1

Long in short, you could try command 'eval' in Matlab. Idk if you are familiar with python, basically 'eval' in Matlab does the same as what 'exec' does in python.

A very simple example below:

for i=1:10
   eval(['f',num2str(i),'=[];'])
end

you'll get f1, f2, f3...... all the way to f10, while they are all empty matrix.

Upvotes: -1

Paolo
Paolo

Reputation: 26014

You may combine compose and cellstr to obtain the desired cell array:

>> wdir = 'path\';
>> X = 1:10;
>> formatSpec = "%s%d.csv";
>> cellstr(compose(formatSpec,wdir,X)).'

ans =

  10×1 cell array

    {'path\1.csv' }
    {'path\2.csv' }
    {'path\3.csv' }
    {'path\4.csv' }
    {'path\5.csv' }
    {'path\6.csv' }
    {'path\7.csv' }
    {'path\8.csv' }
    {'path\9.csv' }
    {'path\10.csv'}

For releases of MATLAB prior to R2016b you may use a loop and sprintf:

>> wdir = 'path\';
>> X = 1:10;
>> formatSpec = '%s%d.csv';
>> arrayfun(@(x) sprintf(formatSpec,wdir,x),X,'un',0).'

ans =

  10×1 cell array

    {'path\1.csv' }
    {'path\2.csv' }
    {'path\3.csv' }
    {'path\4.csv' }
    {'path\5.csv' }
    {'path\6.csv' }
    {'path\7.csv' }
    {'path\8.csv' }
    {'path\9.csv' }
    {'path\10.csv'}

Upvotes: 3

mpaskov
mpaskov

Reputation: 1264

If I understand the question correctly it would be something like this:

files_length = 1000;
for id=1:files_length
    files{id}.data = {sprintf('%d.csv', id)};
end

Upvotes: 0

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