160 Reputation

3 years, 111 days

how to use results from "solve"...

Maple

I solve a system of equations, and am having difficulty 1) understanding what I"m seeing, 2) using the results.

At (21), I get the solution to the system of equations.  I then want to use substitute a value for xC1 that supports the solution, and plug it into the other variables that are solved in terms of it.  However, I can't figure out how to do this.  I keep getting errors like:

Error, invalid input: eval expects its 2nd argument, eqns, to be of type {integer, equation, set(equation)}, but received {Rsrc = .9640102828*xC1^2+0.2570694087e-2*(140625.*xC1^4-151321.*xC1^2)^(1/2), xC2 = -0.1333333333e-2*(281250.*xC1^3+750.*xC1*(140625.*xC1^4-151321.*xC1^2)^(1/2)+51018750.*xC1^2+136050.*(140625.*xC1^4-151321.*xC1^2)^(1/2)-151321.*xC1)/(375.*xC1^2+(140625.*xC1^4-151321.*xC1^2)^(1/2)), xC1 <= -363.3194071}

I assume I'm getting 2 solutions.  I'm picking the first one and trying to then solve for the other variables once I pick a value for xC1.

Thank you,

substitution_help.mw

why won't this simplify?...

Maple 2020

Hello,

I have a complex transfer function.  I've defined everyting as "real" via:

assum := Rsrc::real, C1::real, Lp::real, C2::real, f::real, RL::real, 0 < Rsrc, 0 < C1, 0 < Lp, 0 < C2, 0 < RL, 0 < f

I'm expecting simplify to reduce the following transfer function so that the denominator is real, but I can't get it to do it:

I have every variable defined as real, so I am not sure why it won't simplify this expression.

Thank you

trouble importing Spice netlist into Syr...

I can't figure out how to import a netlist into Syrup.
for_help.mw

I get errors (for the different attempts)-- the latest one  being, "Error, (in sprintf) insufficient parameters for algebraic format"

I had to change it to ".txt" so I could upload it here. Pleae rename to ".cir"

Thanks

Plot v s. semilogplot...

Maple

I have a transfer function:

xfer_mag := 1/sqrt((-1.0000 + 1.0772*10^(-14)*f^2)^2 + (1.9665*10^(-20)*f^3 - 3.6181*10^(-6)*f)^2)

if I do:  semiplotplot(20*log[10](xfer_mag),f=10..30e6) I get :

but if I do: plot(20*log[10](xfer_mag), f = 10 .. 0.30e6), and then use the menu options to the right to change the axes properties to Log, I get this:

what is going on here?  why is the magnitude not the same ?

assumptions not taking?...

Maple 2020

I solve for a transfer function using Syrup, and want to operate on the Real part and Imagninary parts separately.  I've added "assumes" statements for every variable:

assume(Rsrc, real);
assume(C1, real);
assume(Lp, real);
assume(C2, real);
assume(f, real);
assume(RL, real);
additionally(0 < Rsrc, 0 < C1, 0 < Lp, 0 < C2, 0 < RL, 0 < f);

When I then do something like :

instead of gettting just the real part of the expression, I get :

as if one of the variables was still not assumed to be Real.  I'm not sure where all the '~' are coming from ---is that the issue?

I apologize, I can't insert content for some reason..., although I can add the worksheeet.
pi_filter_osc_anal.mw

 1 2 3 4 5 Page 3 of 5
﻿