Truncate decimal numbers in Wolfram Mathematica?

Question

Is there a quick and easy way to truncate a decimal number, say beyond 4 digits, in MATHEMATICA?

With N[1/6, 4] it rounds to =1.6667.

I want you to cut to 1.6666.

Thanks!

Chris Degnen · Accepted Answer · 2018-05-13T14:56:26.393

4

f[x_, n_] := N[IntegerPart[x 10^n]/10^n]

f[1/6, 4]

1.6666

However, note

f[N[531/25], 4]

21.2399

so really some further refinement is required.

edited May 13 '18 at 14:56

answered May 13 '18 at 07:18

Chris Degnen

On Wolfram Alpha, I had to use : `N[IntegerPart[1/6 * 10^4]/10^4]` Does your function need an explicit `[x*10^n]` ? – Anthony May 13 '18 at 07:48
@Anthony No, in Mathematica it is implied/optional. – Chris Degnen May 13 '18 at 07:53

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