how to use symsum for this problem

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Ashutosh
Ashutosh 2022-9-21
评论： Walter Roberson 2022-9-21
sym=symsum([i-Un]^2,i,1,s);
SD=(sym/n)^1/2;

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回答（1 个）

Torsten
Torsten 2022-9-21
Ran in:
If you use symbolic variables, you should name them as such.
And you shouldn't name a variable "sym", especially if you do symbolic computations.
syms Un n i
symbolic_sum=symsum((i-Un)^2,i,1,n);
SD=simplify((symbolic_sum/n)^1/2)
SD = 
  2 个评论
Walter Roberson
Walter Roberson 2022-9-21
Ran in:
Caution, ^1/2 is not ^(1/2)
syms Un n i
symbolic_sum=symsum((i-Un)^2,i,1,n);
SD=simplify((symbolic_sum/n)^(1/2))
SD = 

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