control number of points in a multi-decade log plot

Question

control number of points in a multi-decade log plot

Longbui90274 (Electrical)

(OP)

20 Feb 05 17:22

Hi all,
anyone knows the best way to control the number of points in a log plot, i want to specify a number of point per decade, normal way generates too many points.
Ty a bunch.

IRstuff (Aerospace) · Answer 1 · 2005-02-20 22:45:46

What does the plot have to do with how many points you specified?

If you need a specific point distribution, create one and stick in a vector and plot against the vector.

TTFN

jghrist (Electrical) · Answer 2 · 2005-02-21 09:10:57

I have used the following to generate a vector of currents (i) to plot on the X axis which are evenly spaced on a log plot:

x:=N/log(n_max/n_min)

where N is the number of points desired
n_min is the lowest multiple of a base current
n_max is the highest multiple of a base current

n:=0..N
i_n:=10·n_min·10^((n-x)/x)

i_n is a vector of currents in per unit of the base current

If you wanted 3 decades between 0.1 and 100, with 5 points per decade, you would make

n_min:=0.1
n_max:=100
N:=15

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control number of points in a multi-decade log plot