How to define both integer and decimal increment in one for loop?

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Susan 2021-6-23

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https://ww2.mathworks.cn/matlabcentral/answers/863720-how-to-define-both-integer-and-decimal-increment-in-one-for-loop

编辑： Susan 2021-6-24

采纳的回答： Image Analyst

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Hi all,

I would like to define one for loop that goes from 0 to 1 with an increment of 0.1 and then goes from 1 to 30 by an increment of 2, i.e., combination of the following two loops. Is it possible? If so, how?

for n = 1:2:30
   f(round((n-1)/2+1)) = ....
end
  
  z = 0: 0.1: 1; 
 for n = 1: length(z)
    f(n) = ..
 end

Thanks in advance

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Image Analyst 2021-6-23

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Try this:

allValues = [0:0.1:1, 3:2:30];
numValues = length(allValues)
% Preallocate some results we want to store in the loop.
results = zeros(1, numValues);
% Now loop over all values.
for k = 1 : numValues
	thisValue = allValues(k);
	fprintf('Processing element #%d of %d, which is %f.\n', ...
		k, numValues, thisValue);
% 	results(k) = YourFunction(thisValue);
end

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Susan 2021-6-24

Thank you so much, @Image Analyst! Appreciate your help.

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millercommamatt 2021-6-23

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I'm not clear on what you're looking for. Do you want something like this:

span1 = 0:0.1:1;
span2 = 3:2:30;
span = [span1 span2];
for ii = span
   % do something with ii...
end

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Steven Lord 2021-6-24

@Matthew I suspect Image Analyst was replying to Susan's message not yours. The comment "do something with ii..." suggests to me (and I suspect to Image Analyst as well) that Susan wanted output(ii).

Image Analyst 2021-6-24

I was responding to Susan and just said No, then I went to MATLAB to develop code that works. Then I came back here to further explain why it wouldn't work and edited my comment but then I didn't notice miller's comment since it was posted while I was working on the code in MATLAB, and I mistakenly copied the loop from miller's comment instead of Susan's (not noticing that millers was a new comment). Sorry for the misunderstanding, that sometimes happens when people are posting at the same time. miller's code snippet #2 will also work for Susan.

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