CODEWITHSUNDEEP
matlabmatrix
powerbar
powerbar

Reputation: 343

Find rows in matrix where entries match certain constraints?

I have a matrix in Matlab and want to find the indeces of all rows, where some of the columns meet a specific criteria.

Example

M =

 1     5     9    13
 2     6    10    14
10    14    11    15
 4     8    10    14

Now I want to find the incedeces of all rows, where M(:,3) == 10 AND M(:,4) == 14.

The result should be:

R =

 0
 1
 0
 1

I though about something like

find(ismember(M,[* * 10 14]),1)

but ismember() won't work with wildcars.

Upvotes: 2

Views: 5820

Answers (1)

Oliver Charlesworth
Oliver Charlesworth

Reputation: 272802

R = (M(:,3) == 10 & M(:,4) == 14);

should be sufficient.

Upvotes: 4

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