Extract a row of multiple files in loop

Hi, I would like to get a fixed row from my matrices and save it to one .mat file. for example, in this code, i have 10 different matrices, and would like to save a fixed row (at row 460)from column 1-688. and from the below code, when i put

'line(i) =line+Signal(pixel_line,:);',

it keeps saying

'In an assignment A(I) = B, the number of elements in B and I must be the same.

Error in signal_fluctuation (line 36) line(i) =line+Signal(pixel_line,:);'

please help me. i have no idea how can i do this. BElow is the full code.

clear all close all

addpath 'C:\Program Files\MATLAB\R2012b\toolbox\readimx';

n_i =10; %Number of files

pixel_line = 460;

pixel_line2 = 462;%Pixel line to extract from bottom

Aver_Ray=zeros(520,688);

line=zeros(1,688);

line2=zeros(1,688);

B = readimx('2905_WI-DC\B00001_avg.IM7');

IB = (B.Data);

C = readimx('2905_He-DC\B00001_avg.IM7');

IC = (C.Data);

A = readimx('2905_WI-DC_\B00005.IM7');

IA= single(A.Data);

for i=1:n_i

    %Reading file

    file_name = '2905_WI-DC_\';

    file_end = B00001(i);

    A=readimx(strcat(file_name,file_end,'.IM7'));

    IA= single(A.Data);

    Signal=(IB-IC)'./(IA-IC)';

    Fluctuation=std2(Signal);

    result(i)=Fluctuation;

    line(i) =line+Signal(pixel_line,:);

end

Answer 1

[Mahdi]

I didn't look through the whole code, but based on the error, try the following:

line(i) =line(i)+Signal(pixel_line,:);

Basically, you've defined line (the first time) as a matrix (vector) with 688 values, but when you're telling it to line(i), you're telling the code to only fill one cell, but the right of the equal sign, line is defined as more than one value. I'm not sure what the definition of some of your variables (Signal, Fluctuation, etc...) and their size.

[FAISAL]

Hi, Thanks Mahdi. I tried it but it didnt work either.

Signal is result of a calculation which it is in a matrix of 520x688 fluctuation = the standard deviation of the signal, but the one that i want to save is from the 'Signal' which i have to take the row number 460 from every matrices, and save them into a matlab file.

[Mahdi]

What was the error that you got?

[Mahdi]

Sorry, I also forgot that you need to use do this:

line(i,:)=line(i,:)+Signal(pixel_line,:);

Also, why are you adding line(i,:) to signal if it's just a row of zeros? Can't you just do this?

line(i,:)=Signal(pixel_line,:);