different napisa (a):
I have a program which reads a file containing integer values between 0
and 10. I already use a linear mapping which takes this values and maps
them in a different range.
Now I want to map the values using a logarithmic scale.
For example I want to map from [0;10] to [0.2;5] and values have to
grow following the logarithmic scale.
I can I do that?
Instead of the function log(x), rather you have
to use the following one: log(x - 1), for x >= 0.
Then the interpolation formula for x in [x_1,x_2]
with ratio f = a/(a+b), looks as follows:
(log(x_2 -1) - log(x - 1)) / (log(x - 1) - log(x_1 - 1)) = (1/f) - 1
After a simple calculation one can get
x = (x_1 - 1)^{f - 1} * (x_2 - 1)^{f} + 1 ,
what you expect.
Best Regards,
Z. Karno
--~--~---------~--~----~------------~-------~--~----~
You received this message because you are subscribed to the Google Groups "Algorithm
Geeks" group.
To post to this group, send email to algogeeks@googlegroups.com
To unsubscribe from this group, send email to [EMAIL PROTECTED]
For more options, visit this group at
http://groups-beta.google.com/group/algogeeks
-~----------~----~----~----~------~----~------~--~---
