I have tried many different ways of plotting but it won't make a line graph can someone help me out?

[Walter Roberson]

Click the green Run button. Or go to the command line and command

assignment2

[dpb]

And you'll likely still not see anything on the plot -- certainly it won't be a line -- as you've written the code, you have only a single point each iteration and call plot with

plot(n,x)

in which n is a constant and x is that one point value...

Rethink what you're after here and what you need to draw a line...both an abscissa AND an ordinate variable each of which is a vector of points.

[dpb]

Or, while more advanced and probably not what the lesson is trying to teach, to plot points in a loop when generated one at a time, use animatedline and addpoints.

Answer 1

[Voss]

Either:

n = 100;

for i = 1:n
    
    x = rand();
    
    % ...
    % ...
    
%     plot(n,x);
    plot(i,x,'.');      % use a data marker to see the point,
    hold on             % and hold on for the next point
    
end

Or:

n = 100;

for i = 1:n
    
%     x = rand();
    x(i) = rand();      % collect all x values in a vector
    
    % ...
    % ...
    
%     plot(n,x);

end

plot(1:n,x);            % and plot all the points after the loop

Answer 2

[DGM]

You are creating a plot object that contains only one point, but have no specified marker style to indicate those points. There is a line style implicitly specified, but there is no line plotted because there are no lines.

There is only one plot object because each new point replaces the last one. Use hold on to include more than one graphics object in an axes -- or better, don't do the plotting in the loop.

https://www.mathworks.com/matlabcentral/answers/1648665-no-plotting-done-in-function-with-changing-variables

It's a common question.