Matlab: Make a count-down for loop

Question

Is there an easy way to make a for loop count down instead of up?

I know that I can do something like this:

for i = 1:100
    % do stuff
end

But I need the numbers in the opposite order. When I do this:

for i = 100:1
    % do stuff
end

It says that 'i' is an empty matrix.

Suever · Accepted Answer · 2016-08-02 16:26:15Z

4

You could simply flip the looping variable. This has the benefit of working for any arbitrary looping variable.

for i = flip(1:100)
end

For your specific example, you could specify a negative increment value for the colon operator

for i = 100:-1:1
end

answered Aug 2, 2016 at 16:25

Suever

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