MATLAB: Making a parabola and plotting

parabolaplotting

how can you make a parabola (is it not y = ax^2)? and plot it.

Also how to overlay two more parabolas on the same axes using 0.5a and 2a

Best Answer

You need to use hold() to plot multiple lines on one axes

x = linspace(-5, 5, 100);
y1 = 0.5*x.^2;
y2 = 2*x.^2;
f = figure();
ax = axes();
hold(ax); % to plot multiple lines on one axes
plot(x, y1);
plot(x, y2);

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MATLAB: Draw parabola

doc linspace 
doc plot
doc ezplot %If you have the symbolic math toolbox

A few pointers.

MATLAB: How to put stacked plots in the same graph

Alan,

To plot the data all in the same plot, do something like the following.

x1 = 0:.01:1;
y1 = x1.^2;
x2 = .5:.1:1;
y2 = -1*x2 + 10;
fHand1 = figure;
aHand1 = axes('parent', fHand1);
hold(aHand1, 'on')
plot(x1, y1, 'parent', aHand1);
plot(x2, y2, 'parent', aHand1);

To make the plots scale independent - so the min of the plot is at the bottom and the max is at the top - you need to normalize the y values before plotting. In this case, it helps to remove the y axis labels to avoid confusion. Here is how I did it.

y1 = (y1 - min(y1)) / (max(y1) - min(y1));
y2 = (y2 - min(y2)) / (max(y2) - min(y2));
fHand2 = figure;
aHand2 = axes('parent', fHand2);
hold(aHand2, 'on')
plot(x1, y1, 'parent', aHand2);
plot(x2, y2, 'parent', aHand2);
set(aHand2, 'YTickLabel', [])

Let me know if this solves your problem.

~Jonathan

Best Answer

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