Replacing values based on a condition in a matrix.

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Megan Stapley
Megan Stapley 2019-3-20
评论： Kevin Phung 2019-3-20
Hi there!
I have a 2by2 matrix and am trying to replace every value in the second matrix that is greater than 20 with "on".
So basically I want something like this:
1 2
2 30
30 50
40 10
55 15
to change to this:
1 closed
2 open
30 open
40 closed
55 closed
If anyone can help that would be great! Thanks!

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回答（1 个）

Kevin Phung
Kevin Phung 2019-3-20
编辑：Kevin Phung 2019-3-20
%let M be your matrix;
ind = M(:,2) > 20; %grab indices along second column where value is > 20
M = num2cell(M); % youre going to need to turn it into a cell array
M(ind,2) = {'open'}; %set those indices to open
M(~ind,2) = {'closed'}; %set indices that are not to closed
M
let me know if this helps. Also, I suggest you read about cell arrays:
https://www.mathworks.com/help/matlab/matlab_prog/access-data-in-a-cell-array.html
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Kevin Phung
Kevin Phung 2019-3-20
Happy to help!
As for adding titles to the column, Walter's comment would work.
Another option is to turn the cell matrix into a table:
ind = M(:,2) > 20; %grab indices along second column where value is > 20
M = num2cell(M); % youre going to need to turn it into a cell array
M(ind,2) = {'open'}; %set those indices to open
M(~ind,2) = {'closed'}; %set indices that are not to closed
M = table(M(:,1),M(:,2),'VariableNames',{'Name1','Name2'})
https://www.mathworks.com/help/matlab/ref/table.html

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