plotting information that is above a certain threshold
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If I have a dataset and I want to threshold it I use
thresh = find(dataset > 100)
however, if I want to plot 'thresh' how would I go about this as I know that the find function just gives the indicies at which these values occur.
采纳的回答
Thorsten
2013-1-22
If you want to plot the data above threshold, you can use
dataset_new = dataset(find(dataset > 100));
plot(dataset_new)
5 个评论
Bran
2013-1-22
Image Analyst
2013-1-23
The find() is not needed at all. This works with logical indexing:
dataset_new = dataset(dataset > 100)
No need to convert the logical indexes to actual numerical indexes.
Safwan
2016-11-13
By doing this, it will remove all the data below the threshold value. Would it be possible to change the data below threshold value to zero instead of removing them?
Image Analyst
2016-11-14
Yes.
yourData(yourData < thresholdValue) = 0;
Image Analyst
2016-11-14
You need to put dataset_new on the left hand side:
x = Data_Bushing1(:, 1); % import Y of column 1 from Data_Bushing1
x(x > -2 & x < 2) = 0; % set values in between threshold value to zeros
dataset_new = x;
stem(dataset_new)
x will already have the values in the threshold range zeroed out, which is what you want. So all you have to do is assign it to a new variable, if you even want a new variable. Otherwise you can just use x as-is.
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