Index exceeds matrix dimensions Error.

Hi!

I'm working on a script and while it works with smaller vectors, I can't get it to work with the one I need it to work with which is considerably larger.

Index exceeds matrix dimensions.

Error in avalanchePredictor (line 31)
   dist(i) = sqrt((weather(i,4) - current(1))^2 + (weather(i,5) -
   current(2))^2 + (weather(i,6) - current(3))^2 + (weather(i,7) -
   current(4))^2);

This is the exact error message that I'm getting and below is the code line 31 is around for reference.

dist = zeros(1, 100000);

weather = importdata('weather.csv');
for i = 1:11434
   dist(i) = sqrt((weather(i,4) - current(1))^2 + (weather(i,5) - current(2))^2 + (weather(i,6) - current(3))^2 + (weather(i,7) - current(4))^2);
end

for i = 1:11434
    fprintf(fid,'%10.0f %10.0f %10.0f %10.3f \n', weather(i,(1:3)), dist(i));
end

fid = fclose('all');

As I said, I think I'm trying to loop it for too long or something (I'm not very good at MATLAB to begin with...), and I tried following some fo the suggested steps, but to no avail. Can anybody help me out?

Answer 1

[Image Analyst]

What is 11434? Is that size(weather, 1)? If so, use the size function to be more flexible in case your file is not exactly 11434 rows long. Before the for loop, put this line:

whos weather
whos current

Tell us what it says. My guess is that either current is not 4 elements long or weather is not 11434 rows tall or 7 columns wide. Finally, this is something that you have to look at because once you do you'll be solving this much much faster than posting and waiting for one of us to answer: http://blogs.mathworks.com/videos/2012/07/03/debugging-in-matlab/

[Vilnis]

This is what it says: Name Size Bytes Class Attributes

weather      1x1             3219032  struct              

Name         Size            Bytes  Class     Attributes

current      1x4                32  double

While I may not understand it quite right, I dont think weather whould be 1x1, since the csv file I'm loading it from is 11434 rows tall...

[Image Analyst]

Well you forgot to attach it, and I'm quitting for the day so I won't get a chance to look at it until tomorrow. Did you use csvread() and did you look at the link I directed you to? I expect you'll have it solved by tomorrow. Let me know if you haven't and attach the file. If you have then mark my answer as "Accepted" because I alerted you to the fact that weather is not the array you thought it was.

[Vilnis]

Yep, I figured it out. Thanks!