How to get more precision in comparing Elements of Matrix

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Ahmed khliaa
Ahmed khliaa 2017-11-21
编辑： Adam 2017-11-21
I have a double matrix and i want to pick up the largest element in each column . I found out that Matlab compares only ith 4 numbers after the point , that's what actually matlab shows in the variables window. By changing the Format in the comand windows i get this :
format long
ans =
0.001016470327852
ans =
0.001024700640374
But Matlab is only comparing 0.0010 and considering them equal ...
Thank you in advance
  1 个评论
Adam
Adam 2017-11-21
编辑：Adam 2017-11-21
Matlab uses the complete number for maths. How it is formatted for visualisation is irrelevant. If you need the difference to a high number of decimal places then that is different, but up to double precision the maths is precise for comparing equality or greater than operations.
>> a = 0.001016470327852
a =
0.001016470327852
>> b = 0.001024700640374
b =
0.001024700640374
>> a == b
ans =
logical
0
>> b > a
ans =
logical
1

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