On 12/6/2009 2:00:09 AM, Tom_Gutman wrote:
>It's immediate for me. linterp (as suggested by the name) is a piecewise linear function.
But it is an interpolation and one always expect that both curves (original data and interpolated) seems similars - This prove that this is a bad prejuice. Coordinate transformations preserve linearity if they are linear. There are a big world of non linear transformations out there /:.)
>Linear functions on a semilog graph (just the dependent variable a log) plot as curves. Seems rather obvious to me.
True. More surprising for me the effect of changing ln by log. Not only not interpolate nothing, also draw rect lines for the first points
![](upload/linterp_lineal_in_logx.gif)
>Also, searching for logarithmic interpolation on google I ran across a Mathcad worksheet, which explicitly deals with the linear/non-linear appearance of graphs based on the axis scal.
First, can't understand nothing, but searching in google you're right, there is a similar ws in mathcad: this is not a new question then.
Regards. Alvaro.