find intersection between matrix and vector
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I have a matrix and a vector:
M =
1.0e+010 *
0.1499 0.2998 0.4497 0.0996 0.2495
0.3501 0.2002 0.0503 0.4004 0.2505
0.6499 0.7998 0.9497 0.5996 0.7495
0.8501 0.7002 0.5503 0.9004 0.7505
1.1499 1.2998 1.4497 1.0996 1.2495
1.3501 1.2002 1.0503 1.4004 1.2505
1.6499 1.7998 1.9497 1.5996 1.7495
1.8501 1.7002 1.5503 1.9004 1.7505
v =
1.0e+009 *
1.499 2.998 4.497 5.996 7.495
How can I find the index locations in M where its value == anyone in vector v? Is there a function for this or do I have to use a FOR loop? FIND() only works on vectors.
采纳的回答
Fangjun Jiang
2011-9-23
help ismember
You need to be careful about the floating point comparison though.
M=magic(10);
V=1:10;
[TF,LOC]=ismember(M,V)
1 个评论
Jan
2011-9-23
And if you run into floating point problems: http://www.mathworks.com/matlabcentral/fileexchange/23294-ismemberf
更多回答（1 个）
Walter Roberson
2011-9-23
0 个投票
You probably will not be able to do that using ismember(). See http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
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2011-9-23
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