if statement question on two variables

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John W. Z
John W. Z 2016-6-22
评论： Steven Lord 2016-6-22
there are two variables, f_x2(k)(1*50 double matrix, k=30), f_gbest all are equal to 7.9597,
but "f_x2(k) < f_gbest" returns TRUE!!!
Command History:
>> f_x2(k)
ans =
7.9597
>> f_gbest
f_gbest =
7.9597
>> f_x2(k) < f_gbest
ans =
1
Why returns 1 ? Shouldn't it be 0?

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回答（1 个）

Roger Stafford
Roger Stafford 2016-6-22
Try this:
format hex
f_x2(k)
f_gbest
You might be surprised by the result. Or else you can do this:
fprintf(‘f_x2(k) = %25.20f f_gbest = %25.20f\n’,f_x2(k),f_gbest)
  1 个评论
Steven Lord
Steven Lord 2016-6-22
Or just look at the quantity
delta = f_gbest - f_x2(k)
The value stored in delta will be small but positive. Just because the number is only displayed with a small number of decimal places doesn't mean it's stored with only that small number of decimal places. To display more decimal places, see the help for the format function.

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