How to resolve problem in for loop?

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Ammy
Ammy on 11 Dec 2021
Commented: Ammy on 11 Dec 2021
a=java.math.BigInteger(100)
for i=1:a
a*a;
end
Undefined function '_colonobj' for input arguments of type 'java.math.BigInteger'.
Any help in this regard is much appreciated. Thanks

Answers (1)

John D'Errico
John D'Errico on 11 Dec 2021
Edited: John D'Errico on 11 Dec 2021
Is "a" a number, in the form MATLAB will expect it? NO! a is a BigInteger number. You cannot use the colon operator on a.
a=java.math.BigInteger(100)
a = 100
whos a
Name Size Bytes Class Attributes a 1x1 java.math.BigInteger
So you could have used a loop like this:
for i = 1:double(a)
As far as the actual loop goes, What do you think this
a*a;
Operator '*' is not supported for operands of type 'java.math.BigInteger'.
does? NOTHING. Well, it does something. It throws an error. Because again, multiplcation is NOT supported in MATLAB between java.math.BigInteger objects. And even if it was supported, it would do nothing useful in MATLAB, just dumping the result into the bit bucket.
Anyway, if you want to multiply BigInteger numbers, the Java toolbox provides such a tool. Admittedly, it is a bit of a pain in the neck. This is why I put my own wrapper around those tools for use in MATLAB.
  4 Comments
Ammy
Ammy on 11 Dec 2021
@John D'Errico thank you very much for explanation I got your point, thank you very much.

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