I cannot get fplot to plot my piecewise function past an x-axis value of 5

Question

David Cole 2023-12-31

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编辑： Hassaan 2023-12-31

Here is my code. The axis goes to 7 but the data does not go beyond 5.

syms t %declare a symbol
voltage_values = piecewise(0<=t<=3,25,3<=t<=6,0,6<=t<=7,-75);
fplot(t,voltage_values)
xlim([0 7]) %set the x-axis to 7
title('Inductor voltage')
xlabel('time (\mus)') %\mu adds the micro symbol to the x-axis label
ylabel('voltage (V)')
grid on

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Answer 1

Torsten 2023-12-31

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syms t %declare a symbol

voltage_values = piecewise(0<=t<=3,25,3<t<=6,0,6<t<=7,-75);

fplot(t,voltage_values,[0 7])

%xlim([0 7]) %set the x-axis to 7

title('Inductor voltage')

xlabel('time (\mus)') %\mu adds the micro symbol to the x-axis label

ylabel('voltage (V)')

grid on

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David Cole 2023-12-31

That worked great! Thanks for the quick response!

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Answer 2

Star Strider 2023-12-31

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The default independent variable limits for fplot are (-5,5). If you want a larger or different independent variable value, tell it using the second argument.

Try this —

syms t %declare a symbol

voltage_values = piecewise(0<=t<=3,25,3<=t<=6,0,6<=t<=7,-75);

figure

fplot(voltage_values, [0 7])

xlim([0 7]) %set the x-axis to 7

title('Inductor voltage')

xlabel('time (\mus)') %\mu adds the micro symbol to the x-axis label

ylabel('voltage (V)')

grid on

.

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Answer 3

Hassaan 2023-12-31

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编辑：Hassaan 2023-12-31

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I will assume that the piecewise function should actually have three conditions: up to 3, between 3 and 5, and then from 5 to 7. Here's how you could write it.

syms t % Declare a symbol

% Define the voltage_values as a piecewise function

voltage_values = piecewise(0<=t<3, 25, 3<=t<5, 0, 5<=t<=7, -75);

% Plot the function

fplot(t, voltage_values, [0, 7]); % Set the range of t from 0 to 7

% Set the title and labels with proper units

title('Inductor voltage');

xlabel('time (\mus)'); % \mu adds the micro symbol to the x-axis label

ylabel('Voltage (V)');

grid on

With the range [0, 7] provided to fplot, it will plot the function across the entire x-axis range you've specified. The piecewise function is corrected to reflect three ranges, which should now correctly show values up to t = 7. Ensure that the range of t you plot (using fplot) and the conditions in the piecewise function match to display the data correctly.

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