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2.9.1  Eval a real at a given precision : evalf and Digits, DIGITS)

Input :

1+1/2

Output :

3/2

Input :

1.0+1/2

Output :

1.5

Input:

exp(pi*sqrt(20))

Output :

exp(pi*2*sqrt(5))

With evalf, input :

evalf(exp(pi*2*sqrt(5)))

Output :

1263794.75367

Input :

1.1^20

Output :

6.72749994933

Input :

sqrt(2)^21

Output :

sqrt(2)*2^10

Input for a result with 30 digits :

Digits:=30

Input for the numeric value of eπ√163:

evalf(exp(pi*sqrt(163)))

Output :

0.262537412640768743999999999985e18

Note that Digits is now set to 30. If you don’t want to change the value of Digits you may input

evalf(exp(pi*sqrt(163)),30)

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