Plotting multiple functions getting an error

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Connor LeClaire 2022-1-16

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编辑： Connor LeClaire 2022-1-16

Hello,

I am trying to plot a function and a piecewise function on the same subplot but the second (piecewise) function is not plottedand I keep getting the error:

Warning: Error updating FunctionLine.

DataSpace or ColorSpace transform method failed.

%Edited for clarity
syms w real;
clc;
phase = atand(w/3)+atand(w/5)-90+atand(-w/2)+atand(-w/4); %1st equation
pPhase = piecewise(w<0.2,-90); %2nd equation (currently a test function, but full version will span 0.01→1000), must be piecewise
figure();
fplot(phase,[0.01, 1000]);
set(gca,'Xscale','log')
hold on;
fplot(pPhase);

I would like to plot both functions on the same graph.

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Answer 1

Image Analyst 2022-1-16

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在 MATLAB Online 中打开

If you don't use syms and fplot(), you can do this:

numPoints = 2000;

w = linspace(0, 1000, numPoints);

phase = atand(w/3)+atand(w/5)-90+atand(-w/2)+atand(-w/4);

plot(w, phase, '-');

set(gca,'Xscale','log')

but what is your second function and over what range does it apply to?

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Connor LeClaire 2022-1-16

编辑：Connor LeClaire 2022-1-16

It is the piecewise function 'pPhase' (3rd line from the bottom in my code). Currently just a test function, but it will apply exactly to the plotted range [0.01, 1000].

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