How to get a script to only give me the number of elements less than 2?

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Kyle Donk
Kyle Donk 2020-1-9
评论： David Hill 2020-1-9
I have a script in which y equals 100 various numbers. I was able to sort the numbers in order from least to greatest, but I need the script to give me the amount of numbers that are less than 2. How would I go about doing this?

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采纳的回答

David Hill
David Hill 2020-1-9
nnz(y<2);
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Kyle Donk
Kyle Donk 2020-1-9
But it would make sense for y to change each time I run the script, right? Because if y is a set of 100 random numbers, those numbers would change each time.

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更多回答（1 个）

Meg Noah
Meg Noah 2020-1-9
Here are random numbers as an example. It plots all the values in blue, finds indices for values less than 2, and plots those values in red.
x = 1:100;
y = 20*rand(100,1)-10;
ind = find(y < 2);
figure()
plot(x,y,'.b');
hold on
plot(x(ind),y(ind),'.r');
  2 个评论
Kyle Donk
Kyle Donk 2020-1-9
This is good, but I need the script to only display how many numbers are less than two. I am not allowed to count the numbers manually.
So if there are five numbers less than two, I need the script to give me "5".
Meg Noah
Meg Noah 2020-1-9
编辑：Meg Noah 2020-1-9
to display on the console, just use num2str or fprintf
num2str(numel(ind))
fprintf(1,'There are %d values less than 2\n',numel(ind))

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