symsum returning a large fraction

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Andrew Chen 2017-1-22

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https://ww2.mathworks.cn/matlabcentral/answers/321410-symsum-returning-a-large-fraction

评论： Andrew Chen 2017-1-22

采纳的回答： Niels

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I am using the symsum command to obtain a value for the summation of a series. My specific code is

syms g
SUM = symsum(.9^g,g,0,20);

The answer given to me by matlab is 890581010868487640791/100000000000000000000. I can't seem to change the formatting of the value, any help is appreciated!

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Niels 2017-1-22

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SUM may be of class sym, try

SUM=double(SUM)

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Andrew Chen 2017-1-22

Thanks, this works!

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