strange problem!

endryus · Post by **endryus** » Fri Jul 01, 2005 4:48 am

I have a cable 100 m long analyzed using 60 elements. All the elements have the same length.
If I set the element length as dx=100/60 I obtain wrong frequencies, while if i write dx=1.666667 I obtain exact results. In the first case in fact dx is calculated as 1.0 !!!
Any idea? (Please, don't tell "simply use the second way" as i have to perform many analyses and the dx must be automatically calculated)

endryus

lvy · Post by **lvy** » Fri Jul 01, 2005 7:01 am

you should use dx=100.0/60.0. When you use dx=100/60, program would round-off number.

endryus · Post by **endryus** » Fri Jul 01, 2005 7:35 am

it works. thanks!

endryus

Post by **fmk** » Fri Jul 01, 2005 8:35 am

if you leave off a .0 it assumes integer .. you were getting results of integer division .. if a real number always put the .0 to bbe safe.

silvia · Post by **silvia** » Fri Jul 01, 2005 9:37 am

or even just .

endryus · Post by **endryus** » Sun Jul 03, 2005 11:16 pm

could be useful to write it in the documentation (if not already done)

endryus

silvia · Post by **silvia** » Mon Jul 04, 2005 2:44 pm

i'll try to find a place for it in the introduction to Tcl.