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# To what power can Matlab compute to?

2 vues (au cours des 30 derniers jours)
George Carlisle le 2 Oct 2015
Clôturé : MATLAB Answer Bot le 20 Août 2021
To what level can Matlab compute? I tried to do a permutation calculation and it only went to 9 digits before erroring. Also, are there limits in the education edition vs. the regular one?
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Muthu Annamalai le 2 Oct 2015
You will get results upto double precision.
Steven Lord le 2 Oct 2015
So to compute all permutations of a 20 element vector would require a matrix with this many rows and 20 columns:
>> nrows = factorial(20)
nrows =
2.4329e+18
How much memory would this matrix require, assuming 2 bytes per element?
>> ncols = 20;
>> bytes = 2*nrows*ncols;
>> exabytes = bytes/(1000^6)
exabytes =
97.3161
According to Wikipedia that's roughly between 50000 and 300000 Libraries of Congress worth of data. So how long would it take you to process all those rows at one row per second?
>> processingOnePermutationPerSecond = years(seconds(nrows))
processingOnePermutationPerSecond =
77095595549.806
That's 77 billion years. Earth is around 4.5 billion years old. You might want to rethink your approach to the problem that requires all those permutations.

### Réponses (1)

Sean de Wolski le 2 Oct 2015
What do you need? With Symbolic Math Toolbox, included in Student version, you can symbolically work on very large numbers.
x = sym('pi')
y = x.^234
vpa(y,100000)

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