Plot symbolic expression or function (2024)

Plot tan(x) over the default range [-5 5]. fplot shows poles by default. For details, see the ShowPoles argument in Name-Value Arguments.

syms xfplot(tan(x))

Plot the symbolic function f(x) = cos(x) over the default range [-5 5].

syms f(x)f(x) = cos(x);fplot(f)

Plot the parametric curve x = cos(3*t) and y = sin(2*t).

syms tx = cos(3*t);y = sin(2*t);fplot(x,y)

Plot sin(x) over [-pi/2 pi/2] by specifying the plotting interval as the second input to fplot.

syms xfplot(sin(x),[-pi/2 pi/2])

You can plot multiple lines either by passing the inputs as a vector or by using hold on to successively plot on the same figure. If you specify LineSpec and Name-Value arguments, they apply to all lines. To set options for individual plots, use the function handles returned by fplot.

Divide a figure into two subplots using subplot. On the first subplot, plot sin(x) and cos(x) using vector input. On the second subplot, plot sin(x) and cos(x) using hold on.

syms xsubplot(2,1,1)fplot([sin(x) cos(x)])title('Multiple Lines Using Vector Inputs')subplot(2,1,2)fplot(sin(x))hold onfplot(cos(x))title('Multiple Lines Using hold on Command')hold off

Plot three sine curves with a phase shift between each line. For the first line, use a linewidth of 2. For the second, specify a dashed red line style with circle markers. For the third, specify a cyan, dash-dot line style with asterisk markers. Display the legend.

syms xfplot(sin(x+pi/5),'Linewidth',2)hold onfplot(sin(x-pi/5),'--or')fplot(sin(x),'-.*c')legend('show','Location','best')hold off

Control the resolution of a plot by using the MeshDensity option. Increasing MeshDensity can make smoother, more accurate plots, while decreasing it can increase plotting speed.

Divide a figure into two by using subplot. In the first subplot, plot a step function from x = 2.1 to x = 2.15. The plot's resolution is too low to detect the step function. Fix this issue by increasing MeshDensity to 39 in the second subplot. The plot now detects the step function and shows that by increasing MeshDensity you increased the plot's resolution.

syms xstepFn = rectangularPulse(2.1, 2.15, x);subplot(2,1,1)fplot(stepFn);title('Default MeshDensity = 23')subplot(2,1,2)fplot(stepFn,'MeshDensity',39);title('Increased MeshDensity = 39')

Plot sin(x). Specify an output to make fplot return the plot object.

syms xh = fplot(sin(x))

h = FunctionLine with properties: Function: sin(x) Color: [0 0.4470 0.7410] LineStyle: '-' LineWidth: 0.5000 Use GET to show all properties

Change the default blue line to a dashed red line by using dot notation to set properties. Similarly, add 'x' markers and set the marker color to blue.

h.LineStyle = '--';h.Color = 'r';h.Marker = 'x';h.MarkerEdgeColor = 'b';

Plot sin(x) over the interval [-2*pi 2*pi]. Add a title and axis labels. Create the $$x$$-axis ticks by spanning the $$x$$-axis limits at intervals of pi/2. Display these ticks by using the XTick property. Create $$x$$-axis labels by using arrayfun to apply texlabel to S. Display these labels by using the XTickLabel property.

To use LaTeX in plots, see latex.

syms xfplot(sin(x),[-2*pi 2*pi])grid ontitle('sin(x) from -2\pi to 2\pi')xlabel('x')ylabel('y')ax = gca;S = sym(ax.XLim(1):pi/2:ax.XLim(2));ax.XTick = double(S);ax.XTickLabel = arrayfun(@texlabel,S,'UniformOutput',false);

Create an animation of a parametric curve where one of the parameters changes with time. The - and -coordinates of the parametric curve are given by

By varying the variable from 0.1 to 3, animate the parametric curve.

syms k tfanimator(@fplot,k*t*sin(k*t),k*t*cos(k*t),[-5 5],AnimationRange = [0.1 3])axis equal

playAnimation

writeAnimation("parametricCurve.gif")

fp — One or more function or parameterized line objects
scalar | vector