Thanks, Bob and Eric! - works very well.
Frieda
On Jan 22, 2008, at 7:59 AM, [EMAIL PROTECTED] wrote:
At 1/21/08, you wrote:
Can a for loop in Jmol take two variables, as follows?
for ( var i = -9, j = 2; i < -4.0; i = i + 0.2, j = j + 1 )
no, can't do that. Eric's solution is what you need to do, although it
should read:
var j = 2;
for (var i = -9; i < -4.0; i = i + 0.2);
# do your work here;
j = j + 1;
end for;
Niether += nor ++ have been implemented in Jmol. Since they are simply
conveniences, I'm not seeing them as priority items.
Note that the above loop may not work the way you wish due to
imperfect
representation of decimal numbers in binary. When I ran the following:
FOR (VAR I = -9; I < -4;I = I + 0.2);PRINT I;END FOR;
I see:
-9
-8.8
-8.6
-8.400001
-8.200001
-8.000001
-7.800001
-7.6000013
-7.4000015
-7.2000017
-7.000002
-6.800002
-6.6000023
-6.4000025
-6.2000027
-6.000003
-5.800003
-5.6000032
-5.4000034
-5.2000036
-5.000004
-4.800004
-4.600004
-4.4000044
-4.2000046
-4.000005
Note especially the final value. This is a general problem with using
noninteger numbers in a for loop. Much better would be:
FOR (VAR I = -45; I < -20;I = I + 1);PRINT I/5.0;END FOR;
which gives the expected:
-9.0
-8.8
-8.6
-8.4
-8.2
-8.0
-7.8
-7.6
-7.4
-7.2
-7.0
-6.8
-6.6
-6.4
-6.2
-6.0
-5.8
-5.6
-5.4
-5.2
-5.0
-4.8
-4.6
-4.4
-4.2
Bob
//////////////////////////////////////
Frieda Reichsman, PhD
Molecules in Motion
Interactive Molecular Structures
http://www.moleculesinmotion.com
413-253-2405
//////////////////////////////////////
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