Check NAN values java

Question

It maybe silly question but I need to check if the value of a cell is NAN which means (1/zero) and then convert it to zero I tried the following code

for(i=0;i<5;i++){
do some calculation to get cell[i]
if(cell[i]==NAN)cells[i]=0;}

But this doesn't work because java can't recoginize the variable NAN what I should put instead of NAN Thanks in advance

`0.0/0.0` will get you an `NaN`, not `1.0/0.0`, which will get you `Infinity`. — rgettman, Jan 28 '15 at 01:08
Thanks it works fine I used Double.isNaN() method but I have another problem I am getting both positive and negavtive infinity I need to set the positive infinity to one and the negative infinity to zero what you suggest guys — Ahmad Ghazi Altarabsheh, Jan 28 '15 at 01:41

score 0 · Answer 1 · answered Jan 28 '15 at 01:08

0

You need to use the Double.isNan(double) method. Comparisons with == with NaNs are always false.

if (Double.isNan(cell[i]))

answered Jan 28 '15 at 01:08

rgettman

score 0 · Accepted Answer · answered Jan 28 '15 at 01:08

0

Depending on the type of your array, use Double.isNaN() or Float.isNaN().

answered Jan 28 '15 at 01:08

Thomas

2 Answers2