In Matlab, how can I find the small elements of a vector, and how do I change their values?

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In Matlab, you can use the find function to find the elements of a vector satisfying some condition. For example, the following command will find all elements of a vector called x that are less than .5, and store their indices in a vector called i:

i = find(x<.5);

Suppose, for example, you wish to replace all of the elements of vector x that are less than .5 with 0. You can use the above command, and then the following:

x(i) = 0;

You can combine these into one command:

x(find(x<.5)) = 0;

To set all but the ten largest elements of a vector x to zero, use the following command:

[y,j] = sort(x); x( j(1:(size(x,1) - 10)) ) = 0*j(1:(size(x,1) - 10));

For more about statistical and mathematical software, email the UITS Stat/Math Center, visit the center's web page, or phone 812-855-4724 (IUB) or 317-278-4740 (IUPUI). The center is located in Bloomington at 410 N. Park Avenue, and is open for consultation by appointment Monday-Friday 9am-5pm.

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Last modified on October 04, 2011.

In Matlab, how can I find the small elements of a vector, and how do I change their values?

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In Matlab, how can I find the small elements of a vector, and how do I change their values?

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