[SciPy-user] plot curve of a series of equations
Bevan Jenkins
bevan.jenkins@ew.govt...
Wed Apr 22 23:24:02 CDT 2009
Hello,
I have a series of equations that describe a curve. Each equation is only
valid for a range of x values. For example:
Equation Upperlimit Lowerlimit
24 + 18.75 * x + 4.79616e-013 * x ** 2 + 31.25 * x ** 3 7.800 7.600
28 + 22.5 * x + 5.68434e-013 * x ** 2 + 0 * x ** 3 8.000 7.800
There is a lower limit for eqn1, after that the upper limit of the previous
eqn is lower of the next.
>From (X) scale linear, To (Y) scale linear
y = A0 + A1(x) + A2(x)2 + A3(x)3
where: x= value – LL
LL = the lower limit of the applicable equation
I would like to generate a sequence of values (linspace(min(lowerlimit),max
(upperlimit)), work out x (x=value-approriate lower limit) and then using the
appropriate equation generate the y values.
Below is the answer I am looking for
Value x y
7.600 0 24.000
7.650 0.05 24.941
7.700 0.1 25.906
7.750 0.15 26.918
7.800 0.2 28.000
7.850 0.050 29.125
7.900 0.100 30.25
7.950 0.150 31.375
8.000 0.200 32.5
Thanks for any help,
Bevan Jenkins
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