better than if else conditions

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UNK
UNK 2018-10-28
编辑： Bruno Luong 2018-10-28
I would like to give a tag to a number based on in which region it lies. I am currently using an if else condition. Wondering if there is an easier way.
Note: the intervals are not equal.
Here is the code:
for i = 1:length(data_rot(:,1))
check = acos(data_rot(i,6));
if check >= 0 && check <.6435
tagsPhi(i,1) = 1;
elseif check >= .6435 && check <.9273
tagsPhi(i,1) = 2;
elseif check >= .9273 && check <1.1593
tagsPhi(i,1) = 3;
elseif check >= 1.1593 && check <1.3694
tagsPhi(i,1) = 4;
elseif check >= 1.3694 && check <1.5708
tagsPhi(i,1) = 5;
elseif check >= 1.5708 && check <1.7722
tagsPhi(i,1) = 6;
elseif check >= 1.7722 && check <1.9823
tagsPhi(i,1) = 7;
elseif check >= 1.9823 && check <2.2143
tagsPhi(i,1) = 8;
elseif check >= 2.2143 && check <2.4981
tagsPhi(i,1) = 9;
else
tagsPhi(i,1) = 10;
end
end

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采纳的回答

Bruno Luong
Bruno Luong 2018-10-28
编辑：Bruno Luong 2018-10-28
...
edges= [0,.6435,.9273,1.1593,1.3694,1.570,1.7722,1.9823,2.2143,2.4981,Inf];
[~,~,tagsPhi] = histcounts(check,edges)

更多回答（1 个）

John D'Errico
John D'Errico 2018-10-28
编辑：John D'Errico 2018-10-28
Look at the third output argument from the function histcounts. It does everything you need, in a fully vectorized form. Yes, I suppose it is not fully obvious you should have known to have looked there. Older releases of MATLAB would use histc.

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