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My Mathcad brain causes me to misunderstand some SMATH syntax. The is especially true in XY-Plots. I have created two function: F(s) and F1(s), which is discontinuous. If I redefine the functions as vectors and use augment to define the x-axis, the plots look okay. However, when I try to plot just the function, it does not work. These plots do not create a trace list as with the vector versions. F(s) just doesn’t plot. F1(s) also doesn’t plot, plus it gives an error. In short, how do I plot simple functions? Any help is appreciate, as always.  Plot Functions Question.sm (13kb) downloaded 8 time(s). |
Reg Curry
Loveland, CO
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Hi JReg. If I'm not wrong, just try to plot both with an undefined variable like F(so) and F1(so). The problem is that 's' is a vector.
Best regards.
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Razonar, Thanks much. That works. Hope you don't mind if I have a second question. In this attached sm file, I calculate the solution to an ODE with those two driving functions. Note the last integral in the solution. If I use F(s) it works; however, F1(s) is the function I want in the integral. For some reason it does not work. You will have to change F to F1 in that last integral to see that it fails. Have I missed something obvious? Thanks again. EMISSION REDUCTION Test.sm (29kb) downloaded 13 time(s). |
Reg Curry
Loveland, CO
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It works if you define F1 as: F1(z):=(M*(z-tstart)+Fexp(tstart))*(z≤tfinish)+Fexp(tfix)*(z>tfinish)
i.e. using Boolean values: (z≤tfinish) = 1 if true, 0 if false, etc.
Don't know why SMath has a problem integrating if.. else.. structures.
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Thanks. I’ll give that a try. |
Reg Curry
Loveland, CO
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Originally Posted by: StvMath  It works if you define F1 as: F1(z):=(M*(z-tstart)+Fexp(tstart))*(z≤tfinish)+Fexp(tfix)*(z>tfinish)
i.e. using Boolean values: (z≤tfinish) = 1 if true, 0 if false, etc.
Don't know why SMath has a problem integrating if.. else.. structures. Thanks again. That really helped. |
Reg Curry
Loveland, CO
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Originally Posted by: StvMath Don't know why SMath has a problem integrating if.. else.. structures. Smath integrates if/otherwise discontinuous functions. Bolean must be specified completely, if NOT navigates. Integrate Discontinuous.sm (37kb) downloaded 8 time(s).
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Due to the implementation features, you can't use the function argument the same way you do it in Mathcad. The component allows you to use a vector variable if you add a tilde before the name.  Plot Functions Question (uni).sm (15kb) downloaded 9 time(s). |
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