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changing value in a 2d array

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charlie
charlie 2011-7-11
hi, thank you for your help.
I would like to know how to change values in a 2d array. For example, I have an 2d array A as of 1000x1000, of all zero values
I want to change value in position, 1x1, 1x100, 1x1000 to value 1.
do you know a quick way of doing this?

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采纳的回答

Rick Rosson
Rick Rosson 2011-7-11
Please try the following:
A(1,1) = 1;
A(1,100) = 1;
A(1,1000) = 1;
HTH.

更多回答（2 个）

Walter Roberson
Walter Roberson 2011-7-11
A(1,[1 100 1000]) = 1;
charlie
charlie 2011-7-11
thank you guys, when everytime i run the above function, Matlab automatically loop through the entire 1000x1000 array. as the following:
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
0 0 0 0 0
I dont have any for loop in there, and this took a lot of time to compelete the entire program, do you have any ideas?
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bym
bym 2011-7-12
agree with Oleg, just didn't post soon enough!
charlie
charlie 2011-7-12
thank you very much, you guys are awsome

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