GUI Pushbutton

Hello, I am new to MATLAB. I am trying to implement a push button to plot an array of data. What i want the push button to do is plot a point every time it is pressed. I currently have the button set to where all of the points are plotted. How can i go about plotting each point individually instead of having the button plot everything from my data array?

function [] = send_call(varargin)%callback function

global i;

S = varargin{4};  % Get the structure.
i = i + 1;
ser = varargin{3};  % Get the structure.

a=[3,40,1,8,0,2,4,6,7,3,2,4,6,7,8,9,3,2]
c=[]     

               c(i) = a(i);
               plot(c)
               linkdata on %updates the graph

fprintf(ser,'%s',get(S.mesg,'string'));

end

Answer 1

[Grzegorz Knor]

Do you mean something like this?

function test
x = 1:20;
y = sqrt(x)+randn(size(x));

plot(x,y,'--.')
hold on

uicontrol('Style','pushbutton','Units','normalized','Position',[.05 .05 .2 .1],...
    'String', 'draw','callback',{@send_call,x,y})

function [] = send_call(varargin)%callback function
persistent i
if isempty(i)
    i = 0;
end
x = varargin{3};
y = varargin{4};

i = i+1;
if i<=length(x)
    plot(x(i),y(i),'ro')
else
    warning('Index exceeds matrix dimensions.')
end