find the desired data

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.

Answer 1

[Sean de Wolski]

Something like:

idx = find(abs(x - (-3.6150))<10^-10)

[Kugen Raj]

what is this <10^-10 for?

[Oleg Komarov]

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]

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