How do I add a column to a matrix with specific values?

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Z
Z 2013-7-8
If I have a matrix like so:
1 2 3 4
5 2 6 7
3 6 5 7
How can I add a third column with a value of one for every row that has a value of 2 in the second column? Thanks!

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Z
Z 2013-7-8
Never mind, I found out that this is the syntax:
mydata (mydata (:,2) == 2,4) = 1;

更多回答（1 个）

Greg Heath
Greg Heath 2013-7-10
The question is ill posed.
The matrix has 4 columns and the question is how to add a third column.
The accepted answer is incorrect.
It replaces components in the fourth column
1. Bad question
2. Bad answer.
It should be flagged.

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