MATLAB Plot points joining

Hi,

When I run the following code:

A=tau_invp;
B=T_delayp;
C=K_olp;

figure
grid
hold on;

for n=1:length(zeta_dom_r)
    if abs(zeta_dom_r(n)-0.000)>0.0001
        A(n)=0;
        B(n)=0;
        C(n)=0;
    end
end

D=A./B;
        plot(C, D, '.')

          xlabel('K_{ol}');
          ylabel('\alpha \propto (\tau/T)');
          xlim([0 3]);
          ylim([0 2]);

I get the image with six dot points. But when I put '.-' instead of '.', nothing changes on the graph. I still see simple dots. What could be a possible reason for that? I want to see the dots connected.

Answer 1

[Star Strider]

I can’t run your code because I don’t have your data.

What is the result if you do:

plot(C, D, '-r')

or simply:

plot(C, D)

[Waqas Syed]

Hi,

In both the cases, I get empty figures.

[Star Strider]

I can’t run your code because I don’t have your data.

What are ‘C’ and ‘D’?

[Waqas Syed]

I have attached the data for your reference. You can try it out aswell. i will be grateful.

[Waqas Syed]

Hey Star Strider,

Are you able to access the data that I have provided? Simply import it and run the code and it should be fine.

[Star Strider]

I don’t have ‘zeta_dom_r’.

[Waqas Syed]

Hey, I am sorry I missed out on zeta_dom_r.

Please find attached the file with all the four data elements. Don't use the previous one. I changed it slightly. Anxiously waiting for your response.

[Star Strider]

No file yet.

[Waqas Syed]

Don't know what happened there. Here it is again.

[Star Strider]

I experimented with it, and when I minimally changed your code to move the plot to be after the loop instead of including the loop:

load('Newdata_N60.mat');
A=tau_invp;
B=T_delayp;
C=K_olp;

for n=1:length(zeta_dom)
    if abs(zeta_dom(n)-0.000)>0.0001
        A(n)=0;
        B(n)=0;
        C(n)=0;
    end
end

D = A./B;
Dv = find(~isnan(D));
Dr = [min(Dv) max(Dv)];

figure(1)
plot(C(Dv), D(Dv), 'bp')
xlabel('K_{ol}');
ylabel('\alpha \propto (\tau/T)');
xlim([0 3]);
ylim([0 2]);
grid

I discovered (with ‘Dv’) that you have only one non-NaN point in D. (I plotted it as a star so I could see it. You mentioned that you got six plotted points, so we must not be using the same data.) If you have more than one valid data point, change the plot call to replace 'bp' with 'b.-' to connect them.

Note that NaN values don’t plot, and interrupt the connections between data that otherwise do plot, so it is necessary to eliminate the NaN values before plotting them (as I did here) in order to connect them.

Answer 2

[Tim Jackman]

Try manually setting the LineStyle property manually:

>> lHandle = get(gca,'Children')
>> set(lHandle,'LineStyle','-')

[Waqas Syed]

Added these two lines to my code. Figure is returned as empty.