MATLAB: Simultaneous graph animations issue

animationgraph

So I'm currently attempting to animate multiple graphs on the same page using the comet() funtion, but when I run the functions together, they run one after the other,

each graph is modelled similarly but I'd like to have them all run simultaneously on the same graph. Is that possible for a comet() function?

x = a+b*cos(3*pi*t);
y = b+c*sin(3*pi*t);
plot(x,y);
comet(x,y);
hold on

Best Answer

See animatedline(): https://www.mathworks.com/help/releases/R2020a/matlab/ref/animatedline.html

Try this example

h1 = animatedline('Color', 'r');
h2 = animatedline('Color', 'b');
x1 = linspace(0, 10, 100);
x2 = linspace(0, 10, 100);
y1 = sin(x1);
y2 = cos(x2);
axis([0,10,-1,1])
for k = 1:length(x1)
    addpoints(h1,x1(k),y1(k));
    addpoints(h2,x2(k),y2(k));
    drawnow
end

Related Solutions

MATLAB: How can i draw two animated plots on each subplots at the same time

Merge the for-loops! This works here because x1,y1, x2, and y2 are all the same length. There is also no need for hold on)

x1=linspace(0,20,201);
y1=sin(x1);
x2=linspace(0,20,201);
y2=cos(x2);
sub1=subplot(2,1,1);
axis([0 21 -1.1 1.1]); 
ani1=animatedline('Color','r');
subplot(2,1,2)
axis([0 21 -1.1 1.1]); 
ani2=animatedline('Color','k');
for k=1:length(x1)
    addpoints(ani1,x1(k),y1(k)) ;
    addpoints(ani2,x2(k),y2(k)) ;% I assume you meant to plot (x2,y2)
    drawnow
    pause(0.01);
end

MATLAB: FSOLVE requires all values returned by functions to be of data type double.

If you want to solve a system of equations symbolically or using symbolic variables, use the solve function instead of fsolve. The fsolve function requires that the output of the function you specify as the first input be double precision numbers, not symbolic expressions.

If you must use fsolve with symbolic variables inside the function, you must convert those symbolic expressions into numbers using double before returning the numbers (not the symbolic expressions) from the function.

As a very simple example, put all this code into a function example373677.m and run it:

function y = example373677
y = fsolve(@mysubfun, 3);
 
function z = mysubfun(q)
x = sym('x');
r = x.^3-2*x-5;
z = double(subs(r, q));

Of course, with solve this is easier.

syms x
y = solve(x.^3-2*x-5)

You may need to use vpa to approximate y numerically.

vpa(y)

One of the solutions returned in y should match the result you received from running the function.

Best Answer

Related Solutions

MATLAB: How can i draw two animated plots on each subplots at the same time

MATLAB: FSOLVE requires all values returned by functions to be of data type double.

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