MaplePrimes - answers and comments on Question, How to format numbers and save memory?

Formatted Printing

Doug Meade — Fri, 05 Oct 2007 20:36:39 Z

Jean, One way to do this is with printf (formatted printing). The syntax closely parallels that for C. For the case you give in your original post, here is what I would suggest:

for i from 1 to 10 do
  printf( "%3d %3d %5.3f\n", i, i^2, i^(1/3) );
end do;
  1   1 1.000
  2   4 1.260
  3   9 1.442
  4  16 1.587
  5  25 1.710
  6  36 1.817
  7  49 1.913
  8  64 2.000
  9  81 2.080
 10 100 2.154

Note that this only generates output. There is no matrix of results. This makes this more efficient than your method, but not if you want to have the matrix of values for other purposes. See the online help ?printf for complete details about printf and the different formatting options that are supported. With fprintf you can print results directly to a file. sprintf and nprintf produce strings and names, respectively. I hope this is helpful, Doug

---------------------------------------------------------------------
Douglas B. Meade
Math, USC, Columbia, SC 29208  E-mail: mailto:meade@math.sc.edu       
Phone:  (803) 777-6183         URL:    http://www.math.sc.edu/~meade/

Format numbers

SandorSzabo — Fri, 05 Oct 2007 22:28:02 Z

Hello, A := array(1..10); Digits:=4: for i from 1 to 10 etc.

Matrix

Mariner — Fri, 05 Oct 2007 23:17:23 Z

Jean, Another way of achieving only 3 decimal places is to use interface(displayprecision=3). See the example below. You mentioned array and matrix. In Maple these are different objects, and although you can continue to use them, the newer versions of these - Array and Matrix - are more efficient. Please see ?Array and ?Matrix. Here are two examples of Matrices filled with the initial values that you specified. If you want to see the contents of B, right click on the Matrix placeholder in the output and select Browse. restart; interface(displayprecision=3): f := (i,j) -> `if`(j<=2,i^j,evalf(i^(1/j))): A := Matrix(1..10,1..3,f); B := Matrix(1..1000,1..3,f); Hope this helps. J. Tarr

Thanks a lot!!

Jean — Sat, 06 Oct 2007 18:56:53 Z

Dear Doug, Sandor, J. Tarr, Thanks a lot for the explantion.. your posts are more than sufficient to deal with my problem. Jean