## Questions about Fractions and integers?

Asked by Portgas Ace

### Portgas Ace (view profile)

on 20 Sep 2012
James deleted this, so I (Matt Fig) and rewriting it from memory.
How can I make a way to distinguish between integers and fractions? For example, the output will say fraction if the input is a fraction and will say integer if the input is an integer.

Matt Fig

### Matt Fig (view profile)

on 20 Sep 2012
Usually when a problem is solved, the asker chooses an answer that best suits their needs, rather than editing the question out of existence...
Azzi Abdelmalek

### Azzi Abdelmalek (view profile)

on 20 Sep 2012
James, where is the question and the answer? when you post a question, the answer is useful for all members of this forum
Matt Fig

### Matt Fig (view profile)

on 21 Sep 2012
OP:
How can I make a way to distinguish between integers and fractions? For example, the output will say fraction if the input is a fraction and will say integer if the input is an integer.

### José-Luis (view profile)

on 20 Sep 2012
Edited by José-Luis

### José-Luis (view profile)

on 20 Sep 2012

If integer, the following will return true:
floor(your_num) == your_num;
Otherwise, if the number has a fractional part, it will return false.
If you are talking about data type, Matlab is not a strongly typed language, and by default everything is a double. You can however define a number to have integer type
doc int32
and other flavors of integers.

### Matt Fig (view profile)

Answer by Matt Fig

### Matt Fig (view profile)

on 20 Sep 2012

A = 9; % Also try with A = 7/8;
if floor(A)==A
disp('Integer')
else
disp('fraction')
end

Malcolm Lidierth

### Malcolm Lidierth (view profile)

on 21 Sep 2012
How about A = NaN ?

### Daniel Shub (view profile)

Answer by Daniel Shub

### Daniel Shub (view profile)

on 20 Sep 2012

You can test if a numeric input is an "integer" with validateattributes ...
function TF = mytest(x)
TF = false;
try
validateattributes(x, {'numeric'}, {'integer'});
disp('integer')
catch
disp('fraction')
TF = true;
end