How big is the polynomial that sym2poly can hold?

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sadel
sadel 2011-6-28
How big is the polynomial that sym2poly can hold?
For example, I have this y=sym2poly(sym('x^1000'))
and it's ok. But if I increase the number to x^10000000000, Matlab crashes. How can I avoid this?

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Walter Roberson
Walter Roberson 2011-6-28
Use 64 bit MATLAB on a system that has at least 80 gigabytes of memory.
Suppose that the sym2poly worked, then the vector returned would have to have 10000000001 elements, each a double precision number. That would be 80000000008 bytes, which is about 75 gigabytes.
The limitation you are encountering isn't sym2poly itself: the limitation is the amount of memory you have.

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Sean de Wolski
Sean de Wolski 2011-6-28
2.8823e+17
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Walter Roberson
Walter Roberson 2011-6-28
Did I say "up to 64 bytes" ? I meant "up to 2^64 bytes".
Maybe some day we'll get to edit comments...

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