Precision numbers...

PS : I use GAUSS ENGINE 13

You change the format of your print statements by using the format command. Here is a basic example:

a = rndn(100,1);

format /rd 8,3;
print meanc(a - meanc(a));

This will return:

  0.000

The first input to format, in this case /rd, tells GAUSS to:

1. r - right format the printed output
2. d - print the data as a decimal

The second input to format, in this case 8,3, tells GAUSS to:

1. 8 - give each printed number enough space for 8 characters
2. 3 - print out 3 decimal places

If you wanted to print numbers that were left formatted using scientific notation rather than decimal format and wanted to print 4 decimals, you could enter:

format /le 8,4;
print meanc(a - meanc(a));

This will return something like:

2.2204e-17

Besides the d and e options, you can also use the z option. This will use either decimal or scientific notation, whichever is more concise. It will also suppress trailing zeros. Here is a link to another post describing this.