I tried debugging the code it works until it reaches line 31 (temp=pad...) i dont know what i am doing wrong but can u help me with this error it is indicated after the code

close all clear all

load C:\Users\Traddadi\Desktop\biomed_img\project_2\rfdata\cystdata ri theta

fc=5e6; % center freq in Hz fs=5e7; % sampling freq in Hz r0=0.07; % focal depth in m dt=1/fs; xn=ri/1000; c=1540; % acoustic wave velocity in the medium in m/s t=2*r0/c; % time in

d = dir('*.mat'); % looks for .mat-Files for i = 1: 127 load(['rfline' num2str(i) '.mat']) for j= 1:128 tau(j)=(((xn(j).^2*cos(theta(i)).^2)/2*c*r0)-(xn(j).*sin(theta(i))./c)); end end

tau % notes delay =abs(tau)*fs; max_delay=max(delay); pad=zeros(8192,length(xn));

for i = 1: 128 rflines=sum(pr,2); temp=pad(rflines,delay(1,i),'post'); temp=pad(rflines,max_delay(1,i),'pre'); rfdata(:,i)=temp; end

figure, imagesc(abs(hilbert(rfdata))) colormap(gray)

when I run the code i have the following error:

??? Subscript indices must either be real positive integers or logicals.

Error in ==> test_bio_code_pj2 at 31 temp=pad(rflines,delay(1,i),'post');

[Laurent]

The error seems to happen in your function 'test_bio_code_pj2'. Since this is not a standard Matlab function, you should provide it. Otherwise there is no way that someone can help you to solve the problem.

[Wouter]

Probably

rflines

or

   delay(1,i)

is not well defined. Did you set 'i' correctly in the test_bio_code_pj2?

[Image Analyst]

http://www.mathworks.com/matlabcentral/answers/13205-tutorial-how-to-format-your-question-with-markup

[Laurent]

Thanks Image Analyst, only now I realize that Talal was actually posting the code of test_bio_code_pj2. I was confused because I didn't see 31 lines.

Answer 1

[Iain]

Put a breakpoint in your code at line 31, and look in the memory of the function for a variable called pad. I suspect that you load in a variable with that name, so that when you attempt:

 temp = pad(rflines,delay(1,i),'post');

That matlab identifies "pad" as a variable, then attempts to access it using the index " 'post' ", which is garbage.

padarray might be a better option than pad.

[Image Analyst]

padarray() is in the Image Processing Toolbox.