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find the desired data

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Kugen Raj
Kugen Raj 2012-3-8
i have sample data in which i want to look for a desired value. Columns 260 through 266
-12.0381 -9.8567 -7.9494 -6.2871 -4.8478 -3.6150 -2.5755
Columns 267 through 273
-1.7197 -1.0401 -0.5313 -0.1895 -0.0127 0 -0.1522
Columns 274 through 280
-0.4713 -0.9611 -1.6269 -2.4760 -3.5183 -4.7665 -6.2372
above is part of the data that i calculated. I need to find the location of values(-3.6150). Im calculating this value for 100 times. So, i have to find -3 value in each loop.

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回答（1 个）

Sean de Wolski
Sean de Wolski 2012-3-8
Something like:
idx = find(abs(x - (-3.6150))<10^-10)
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Oleg Komarov
Oleg Komarov 2012-3-18
10 to the power of -10, i.e. 0.0000000001.
It's the tolerance.
Sean showed you how to carry out "floating point comparisons".
Image Analyst
Image Analyst 2012-3-18
See the FAQ: 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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