Help with writing loop for multiple input files
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Hi, I am having trouble writing a loop that reads multiple .raw files. The input files are 375x223x91 data sets. I have tried to write a for loop for this but have been unsuccessful. The details are:
vol=read_raw8b('Z:\520\ 1.raw'); %import data
Then executes code...
read_raw8b is a function:
function block=read_raw8b(filename)
fid=fopen([filename],'rb');
block=fread(fid,'*uint8','ieee-le');
fclose(fid);
I would like to write a loop that after executing the code for data set '1.raw' it then loops and imports '2.raw', then executes the same code and so on for 52 data sets.
Also I have a variable in the code called 'map' and I would also greatly appreciate if you could let me know how I can increment this so that when it reads '1.raw' and executes the code it stores variable 'map_1' and when it reads '2.raw' and executes the code it stores as 'map_2' and so on.
Thank you
4 个评论
Adam
2016-5-13
Why would you want variables map_1 and map_2 instead of just a single variable array containing map(1) and map(2)?
ajk1
2016-5-13
@ajk1: changing the names of variables in a loop is a really bad idea. While it is possible, it will be slow, buggy, obfuscated code. As Adam already implied, your best option is to simply use one variable and some indexing. Try using a cell array, it is really simple.
Read this thread and all of its links to know more about why you should not dynamically access variable names:
Read those links carefully! Notice how many expert MATLAB users have clearly written "do NOT create variable names in a loop". Also notice how many beginners keep inventing this idea!
Many beginners believe that defining or accessing variables in a loop would be a great idea. It isn't. It is a bad way to write code.
Just use one variable and some indexing.
ajk1
2016-5-13
采纳的回答
Azzi Abdelmalek
2016-5-12
for k=1:n
file=sprintf('Z:\520\%d.raw',k)
vol=read_raw8b(file)
end
4 个评论
ajk1
2016-5-13
编辑：Azzi Abdelmalek
2016-5-13
I completely agree with Azzi,
don't listen to that chachara of 'don't create variables in loops' without showing you consistent evidence.
If it works and the delay is acceptable, you pack it and you sell it, next one please, if you understand what I mean.
So, on the loop, just one correction, with Azzi's permission, instead of sprintf try
L1='Z:\520\';
for k=1:52
file=strcat(L1,char(k+48),'.raw')
vol=read_raw8b(file)
end
and because you said you have up to 52 files, and you may want to have them listed in alphabetic order, you may want to consider naming them 01.raw 02.raw ..
so, you may want to insert in Azzi's loop the following:
L1='Z:\520\';
for k=1:52
if k<10
file=strcat(L1,'0',char(k+48),'.raw');
else
file=strcat(L1,char(floor(k/10)+48),char(rem(k,10)+48),'.raw');
end
vol=read_raw8b(file)
end
John
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