seeing frequency of curve

[alican]

Hi, I made a curve fitting, and i need to see frequency at this curve, but it doesnt work.

if i enter random frequency, i get curve without any problem but if i use real frequency, curve loooks like, +2 more for every value. real frequency is so higher than values i enter.

Could anyone tell me , what can be problem here?

thanks a lot

(i couldnt add picture in other way, because this is not my pc, and i cannot install adobe, i hope it is not a problem)

[Henrik_Volkers]

It's because of the numeric ....   the relative deviations are small ....

You can push it to better fit by:

Preprocessing your data to better fit the numeric fitting process

or tell the fit vi to work with smaller tolerances (will end at some degree... see numeric resolution, epsilon, ...)

[alican]

Thanks for your answer Henrik, my labview is labview 2009. i think it is possible to save vi, for previous versions, can u save it for labview 2009?

bye the way,

danke, i am also in germany:)

[Henrik_Volkers]

Tw0 options:

wait until I get back to my PC or

play with the fitting parameters tolerance (1e-12) and fitting algorythm 😉

[alican]

i made algorythm "givens" and tolerance as u said 1e-12. it made a nice curve:)

thanks