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I'm getting an error and don't know how to fix it.

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So I'm averaging a bunch of data and instead of opening up all the files manually and such, I'm using a for loop. Here's what my code looks like.
close all;
clc;
for k=1:10
filename=sprintf('20.5in_%d.bin',k);
fid=fopen('filename','r');
data=fread(fid,[1,Inf],'single');
sum=sum+data;
end
Average=sum/10;
plot(data/max(data));
plot(Average/max(Average));
close all
However, I get this error when I try to run it.
Error using fread
Invalid file identifier. Use fopen to generate a valid file identifier.
Error in in205 (line 6)
data=fread(fid,[1,Inf],'single');
I'm not sure what the problem is or how to fix it. If I don't use a loop it works so any help would be greatly appreciated!!!
close all;
clc;
fid=fopen('20.5in_1.bin','r');
data=fread(fid,[1,Inf],'single');
plot(data/max(data));
close all
^the code that works without the loop

Accepted Answer

David Fletcher
David Fletcher on 13 May 2021
The filename is the name held in the variable, the file isn't called 'filename'
fid=fopen(filename,'r')
  2 Comments
David Fletcher
David Fletcher on 13 May 2021
Easily done. I swear sometimes the brain sees what it thinks it should be seeing, and not what is actually there

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