Clear Filters
Clear Filters

Length/Index based if else statements

3 views (last 30 days)
I have a vector of variable length, for example
b = [0.25;0.5;0.75;1;1.5;1.75;2.0];
and based on the length of this vector, I have some specific parameter K against each element of b, x is the input and my final output is m
if x < b(1)
m = K(1);
elseif x < b(2)
m = K(2);
elseif x < b(3)
m = K(3);
elseif x < b(4)
m = K(4);
elseif x < b(5)
m = K(5);
elseif x < b(6)
m = K(6);
m = K(7);
I want to generalize my code based on the length of b. Here, the length was 7 so I had to run it manually like this for 7 elements. How can I generalize this for any length of b?

Accepted Answer

Voss on 1 May 2022
Edited: Voss on 1 May 2022
idx = find(x < b,1);
if isempty(idx)
idx = numel(b);
m = K(idx);
The above assumes b is sorted in ascending order, as in the example. If b is not necessarily sorted, you'd have to sort it first.
Joe Jones
Joe Jones on 27 Jul 2022
Have you solved this problem? I met the error recently.
compilation of model failed while trying to resolve underspecified signal dimensions
Fawad Farooq Ashraf
Fawad Farooq Ashraf on 30 Jul 2022
@Joe Jones I guess you have to use the "Ports and Data Manager" for that. In the editor window for MATLAB Function, click on "Edit Data" and then try to specify the type and size. That should work for you.

Sign in to comment.

More Answers (0)


Find more on Shifting and Sorting Matrices in Help Center and File Exchange




Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!