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Questions about Fractions and integers?

Asked by Portgas Ace 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.

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Usually when a problem is solved, the asker chooses an answer that best suits their needs, rather than editing the question out of existence...
James, where is the question and the answer? when you post a question, the answer is useful for all members of this forum
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.

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3 Answers

Answer by José-Luis
on 20 Sep 2012
Edited by José-Luis
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.

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Answer by Matt Fig
on 20 Sep 2012

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

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How about A = NaN ?

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Answer by Daniel Shub
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

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