Matrix from for loop displaying vectors of different length

Question

Arthur Batte 2020-7-9

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https://ww2.mathworks.cn/matlabcentral/answers/562589-matrix-from-for-loop-displaying-vectors-of-different-length

评论： KSSV 2020-7-11

files.zip

Hello, could someone advice. I have wriiten some code (readout.m) that reads a file containing names of 3 data files (filenr.lis). These 3 data files are stored in a directory named wavf. These 3 data files are not of the same length. My code outputs all the 3 datas as vectors of different lengths and stores the results in a variable named output. Unfortunately i have failed to save the 3 results in a matrix whereby the length of the matrix is scaled by the smallest length. I mean trim the datasets such that they have the same lengths and then output the result as a matrix outside the loop. I have attached the datasets in a zip. thx

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Answer 1

KSSV 2020-7-10

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https://ww2.mathworks.cn/matlabcentral/answers/562589-matrix-from-for-loop-displaying-vectors-of-different-length#answer_463811

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You need to interpolate them to the same size using interp1.

clc
clear
close all
[index, sname] = textscan('filenr.lis','%d %s');
N = length(index) ; 
iwant = cell(N,1) ; 
for k = 1:N
    wavfilepath = '\\GSE\\';
    sfiles =char(sname(k,:));
    s = [wavfilepath sfiles];
    fid = fopen(s);
    [data] = readfile(fid);
    iwant{k} = data{1};   % load data of the file 
end
% do interpolatio to make them to same size 
L = cellfun(@length,iwant) ;   % length of each array 
Lmax = max(L) ;  
data = zeros(L,N) ; 
for i = 1:N
  x = 1:length(iwant{i}) ; 
  y = iwant{i} ; 
  xi = linspace(1,length(iwant{i}),Lmax) ; 
  data(:,i) = interp1(x',y,xi') ; 
end