extracting data from text file
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I have a text file which consists of only numbers in the form of an array. I wish to create a for loop which will extract first 100 digits for the first loop, next 100 digits for the second loop. Could anyone help me please?
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shru s
2017-6-22
You can do it in a simple way opening the file with fopen, reading all you want to read with textscan and then closing it with fclose. See doc of textscan: www.mathworks.com/help/matlab/ref/textscan.html
回答（1 个）
>> 27*3500*8/1024/1024
ans =
0.7210 MB
>>
Isn't all that big by today's standards. Just read the file and do whatever as Stephen suggested.
x=textread('yourfile','');
For the base case; adjust for delimiter, etc., as required if required (we aren't given those details).
textread works for such simple files easier than textscan as it
- Uses the filename rather than needing fopen and file handle,
- returns double array be default where a cell array is unneeded overhead
- the empty format string(*) returns the array in the shape as in the file as number of fields per record so don't have to count delimiters or know the number a priori.
() In fairness, this is a feature in |*textscan|, too, although the documentation of it while extremely valuable is getting harder to find with each and every release it seems.
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