plotting information that is above a certain threshold

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.

Answer 1

[Thorsten]

If you want to plot the data above threshold, you can use

dataset_new = dataset(find(dataset > 100));

plot(dataset_new)

[Bran]

Thank you Thorsten this is just what I needed :)

[Image Analyst]

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]

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]

Yes.

yourData(yourData < thresholdValue) = 0;

[Image Analyst]

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.