Number of values between constraints

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Daniel 2011-12-5

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t=linspace(0,pi,1001); y=floor(100.*sin(t));

Find the number of values of y between 25 and 71, inclusive.

Okay, so it's basically finding the length of the values in between the given range. I can tell that it'll require looping, but I don't know how to set it up. Thank you for any and all help

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Sean de Wolski 2011-12-5

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在 MATLAB Online 中打开

No reason to loop:

n = sum(x>=25&x<=71)

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Walter Roberson 2011-12-5

sum(x(:)>=25 & x(:)<=71)

Daniel 2011-12-5

Ah, I see. I had to tweak the format of the other equations, but your code was solid. Thank you so much.

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Walter Roberson 2011-12-5

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Use the logical indexing techniques you learned from your previous question, and then instead of summing the contents of the array, determine the number of "true" comparisons that resulted (I'm deliberately not saying how to do that; you should be able to build on the previous techniques.)

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Daniel 2011-12-5

Thanks Walter, I've used the "For", and then used an "If" to verify which values fall within the range. What I'm having trouble with is getting the "length" of those values. Is there a way to assemble them in a matrix from the looping process and then simply use "length" on that matrix?

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