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To what power can Matlab compute to?

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George Carlisle
George Carlisle 2015-10-2
关闭： MATLAB Answer Bot 2021-8-20
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
Muthu Annamalai 2015-10-2
You will get results upto double precision.
Steven Lord
Steven Lord 2015-10-2
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.

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Sean de Wolski
Sean de Wolski 2015-10-2
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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