Want to remove 'noise' from a matrix.
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I have a single column matrix with values ranging from around -15 to 50, there's around 19000 values and I wish to remove any values below 20 and set them as 0. This is what I currently have to import the data:
input = xlsread('HiG_67.csv','J:J');
Thanks
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Stephen23
le 8 Oct 2015
Do not call your variable input as this is the name of a commonly used inbuilt function input. When you shadow the name of an inbuilt function like this it stops the inbuilt function from working.
For this reason never use the names size, length, input, i, j, cat, length, etc. You can use which to check if a name is already used-
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Dennie
le 8 Oct 2015
If input is a non-negative single column then you can use the following simple filter:
FilterValue=20;
input(input<FilterValue)=0;
If there are also negative values that you wish to keep then you can try:
input(abs(input)<FilterValue)=0;
If you only want to filter the positive noise:
filter=input<FilterValue & input>=0;
input(filter))=0;
Dennie
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