Please answer! How to use an if function effectively?
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Hi everyone,
I have a set data loaded into the workspace at 4x100, using the if function to analyse a certain colomn within that data to see say if any value is say greater than 2, and then say if a number within that coloum is greater than 2 then set a number on that same line from a different colomn say in the second coloum to a variable.
Eg, say coloum 4 is the colum i want to analyse, to see if any number in that colum is greater than 2, say lines 30, 67 and 80 are greater than 2, i want the function to then set column 2 values from lines 30, 67 and 80 to a variable lets say x. If that makes more sense
Thank you!
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dpb
am 9 Nov. 2020
Bearbeitet: James Tursa
am 9 Nov. 2020
colmn_analyze=4; % desired column to compare
colmn_target=2; % desired column to set
valLimit=2; % limiting value
% engine
ix=(A(:,colmn_analyze)>valLimit); % logical vector of locations match condition
A(ix,colmn_target)=x; % set the target column locations to value of x
NB: x must either be a scalar or a vector of length of TRUE elements in ix in the order to match or will have a number elements mismatch on the assignment.
Read up on logical indexing in the Getting Started doc for a most useful feature in MATLAB.
7 Kommentare
James Tursa
am 9 Nov. 2020
Do you mean like this?
colmn_other = 6;
A(ix,colmn_other) = A(ix,colmn_target)
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