## how to find the equality of 2 numbers?

Asked by Sivakumaran Chandrasekaran

### Sivakumaran Chandrasekaran (view profile)

on 10 Sep 2012
Accepted Answer by Andrei Bobrov

### Andrei Bobrov (view profile)

a e

1 1

1 2

3 2

3 2

The above is my input table. Check 'a' for the value '1'. The corresponding 'e' value differs. So, we should not consider it. Check 'a' the value of '3'. The corresponding 'e' values are same. How to develop code for this?

Sivakumaran Chandrasekaran

### Sivakumaran Chandrasekaran (view profile)

on 10 Sep 2012

Yes. As Image Analyst told, 'a' and 'e' are column headers... There is no '' strings'' in my input values

Image Analyst

### Image Analyst (view profile)

on 10 Sep 2012

Then see my answer. Also, what does "class(a)" show when you issue that command? If you want to make absolutely sure a and e are integers, wrap them in an int32() when you create them.

Walter Roberson

on 10 Sep 2012

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### Andrei Bobrov (view profile)

Answer by Andrei Bobrov

### Andrei Bobrov (view profile)

on 10 Sep 2012
```AE = [a e]; %The initial array
out = AE(abs(diff(AE,1,2)) < eps(100),:);
```

#### 1 Comment

Sivakumaran Chandrasekaran

### Sivakumaran Chandrasekaran (view profile)

on 10 Sep 2012

Hi Andrei,Thanks. Your answer matches my requirement 90%.. for no.'2' your code works fine. Since there is a deviation in '1' it should not come. You can see the change in the value of 'e' when the value of 'a' is 1. Can you modify the code

### Adrian Dronca (view profile)

on 10 Sep 2012

I think you should consider using isequal() . The function works with single, double, string.

### Image Analyst (view profile)

Answer by Image Analyst

### Image Analyst (view profile)

on 10 Sep 2012

If they're integers, use ==, like

```if a == e
```

if they're floating point, you need to check against a tolerance:

```if abs(a-e) < 0.0001
```

See the FAQ for more info: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F

### Sivakumaran Chandrasekaran (view profile)

Answer by Sivakumaran Chandrasekaran

### Sivakumaran Chandrasekaran (view profile)

on 12 Sep 2012

When you go through the first two rows, you can find that the change in the values. So, '1' should be omitted. There is no change in 3rd and 4th row.. 'e' value does not gets changed. So, we can consider 'e' .

How to do this??