MaplePrimes - answers and comments on Question, fix demal places [evalf?]

==========================

casperyc — Sun, 07 Mar 2010 23:20:49 Z

================================

poi:

================================

That's the code. It didnt display correctly.

Thanks

not quite

Axel Vogt — Mon, 08 Mar 2010 00:16:55 Z

It controls the precision, not the display, from the help: "To specify the numeric precision for an evalf computation ..."

What you want (2 correct leading decimals) can be done like this:

for i from 0 to 4 do  evalf[20](poi(i)*10000); evalf[2](%); print(%);  end do:

I want it to have two

casperyc — Mon, 08 Mar 2010 00:29:22 Z

I want it to have two decimal places like this:

8005.15
1781.15
198.15
14.70
0.82

(the decimal point need not to be aligned)

Thanks.

printf

djc — Mon, 08 Mar 2010 01:30:28 Z

You can use the printf command for this purpose:

poi:=x->exp(-0.2225)*0.2225^x/x!;

for i from 0 to 4 do printf("%10.2f\n",poi(i)*10000); end do:

See it in the help:
?printf

formatted printing

Axel Vogt — Mon, 08 Mar 2010 01:31:32 Z

formatted printing uses a C-like syntax:

printf("x=%.2f", 12345.6789);
x=12345.68

a:=sprintf("x=%.2f", 12345.6789):
parse(%);
                             x = 12345.68