Matlab is rounding all answers to 4dp when I use syms.

Question

redman 2021-3-3

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https://ww2.mathworks.cn/matlabcentral/answers/762181-matlab-is-rounding-all-answers-to-4dp-when-i-use-syms

编辑： Rashed Mohammed 2021-3-8

Matlab keeps rounding my outputted values in the command window to 4dp, I've looked all over mathworks and I can't find a solution to my problem in particular. Does anyone know how I can fix this?

syms x n
f(x) = (2/sqrt(pi))*symsum(((-1)^n * x^(2*n +1))/((2*n+1)*factorial(n)),n,0,100);
f(0.1)
ans = 
0.1125

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Answer 1

Rashed Mohammed 2021-3-8

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https://ww2.mathworks.cn/matlabcentral/answers/762181-matlab-is-rounding-all-answers-to-4dp-when-i-use-syms#answer_641796

编辑：Rashed Mohammed 2021-3-8

Hi John,

Assuming you have set the preference option "FloatingPointOutput" to true in sympref, the output will be fixed-decimal format with 4 digits after the decimal point. If you need to change the number of digits after the decimal point, consider using vpa function with the number of significant digits you need.

Hope this helps.