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Change in matrix without re-writing

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Rand Renwar
Rand Renwar 2016-9-29
评论： Rand Renwar 2016-9-29
So if I have a 2x4 matrix, how do I change a number in that matrix without having to re-write the entire matrix?
M = [ 1 3 5 2
-1 0 1 7];
(M is one big matrix, I'm sorry but I'm quite new here) If I wanted to change the 7 to a 8 for instance, what would be the fastest way?
Thanks

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Geoff Hayes
Geoff Hayes 2016-9-29
Rand - since the 7 is in the fourth column of the second row, then the easiest way to change this to an 8 is as follows
M(2,4) = 8;

更多回答（1 个）

Steven Lord
Steven Lord 2016-9-29
Indexing.
A = zeros(5, 5)
A(3, 4) = 7
A(10) = 2
A(A > 5) = 5

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