How to plot point-wise figures from existing one.

According to the attached figure w is zero for specific z. Need help how to plot only the value of z for each case (when w becomes zero).

Answer 1

[Pawel Jastrzebski]

Consider the following example:

% Data
w = -1:0.02:1;
z = (-w.^2)+10;
% Condition - logical vector
wAtZzero = w == 0;

% Plotting
% p(1) - all data
% p(2) -  'z' @ 'w=0'
f    = figure;
p(1) = plot(w,z); 
hold on
p(2) = scatter(w(wAtZzero),z(wAtZzero),'or'); 

xlabel('w');
ylabel('z');

set(gca(),...
    'YAxisLocation', 'origin');

Figure output:

Terminal output:

>> z(wAtZzero)

ans =

      10

[Dereje]

Thanks! My inputs, w and z are arrays: z{k} and w{k}. How can I plot them specially when they are inside a loop. For example my original plot is this one

for k=1:size(y0mat,1)
plot(w{k},z{k})
end

Thanks a lot!

[Pawel Jastrzebski]

In order to answer that, you need to attach the content of the following variables: y0mat, w, z.

[Dereje]

I have attached the -mat file. w and z are changed with another variable. Thanks

[Pawel Jastrzebski]

It's a bit confusing. In your code:

• The bit of code you've posted in your previous reply doesn't exist so I had to add it manually to see how it plots
• But it doesn't plot because variable w doesn't exist anymore - what is a new w then?
• Also you've got variable z which is a vector but you're trying to access is as if it was a cell
• Therefore, please specify: which variables do I need to plot against each other to obtain the plot you attached to this question?

Other notes:

• I recommend moving your figure(1) declaration outside the for loop