How to make a 2D plot of a function with an additional parameter, which I can change "live"?

Hello, guys!

Imagine that we have a simple function y=x+1+C. I'd like to have a 2D plot for x-y and add an additional "bar" to change the parameter "C". Any ideas how I can do it?

Answer 1

[Jorge Mario Guerra González]

there is option to link plot when you open figure

for example:

C=0;
x=1:1:100;
y=x+1;
plot(x,y)

then enable plot linking

 linkdata on

Check what happends when you change C value and reassign Y:

C=1000;
y=x+1+C;

It can be enabled from that button as well.

[John D'Errico]

One nice thing about Answers is we can all learn something. This is a feature that I did not know existed.

[Jorge Mario Guerra González]

@John D'Errico absolutely!

Answer 2

[Vlad Matjuschkin]

Hi Jorge,

It works, BUT, to change the "C" you need to type

C=1000;

y=x+1+C;

every time.

Let's say, we want to check one hundred values C=1:1:100. We will spend lots of time by typing that again and again ... Is there any other method or app? I simply want "shift" the C-value up and down and see how the function will change.*

*I saw one guy could do it in Excel. He said he installed a special "macro" ... People do it in Maple as well. If excel can do it, why not MATLAB?

[Stephen23]

Just add a slider and a callback function:

https://www.mathworks.com/help/control/ug/build-app-with-interactive-plot-updates.html

Or for older versions of MATLAB, adapt this demo:

https://www.mathworks.com/matlabcentral/fileexchange/1670-scrolling-plot-demo

[Jorge Mario Guerra González]

Well, typing C=... is just an example, if you are working on a GUI

then add the command

 linkdata on %which enables linkdata on your axes.

put that into the callback of the slider. Then instead of typing C, you put something like...

 handles.C=get(handles.slider1,'Value');
 y=1+x+C;
 axes(hanldes.axes1)   %Select the axes you want to plot it on
 plot(x,y)