How do I plot a point on a graph?

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Erick Santiago el 18 de Abr. de 2021
Comentada: Robert Brown el 18 de Abr. de 2021
I want to plot my tau max on my Mohr's Circle graph which I was thinking was plot(C,R) but I am not getting any results. I also want it to display the value on the graph which should be 612.11
sigx=-30.90;
sigy=51.06;
tauxy=-610.74;
R=sqrt(((sigx-sigy)/2)^2+tauxy^2)
C=(sigx+sigy)/2
sig1=C+R
sig2=C-R
sigma=linspace(sig2,sig1,1000);
tau1=sqrt(R^2-(sigma-C).^2);
tau2=-tau1;
plot(sigma,tau1,'b',sigma,tau2,'b')
title('Mohrs Circle (1672.13 lbs)')
xlabel('\sigma(psi)')
ylabel('\tau(psi)')
axis('square')
hold on
plot([sig1,sig2],[0,0],'k')
plot([sigx,sigy],[-tauxy,tauxy],'g')
grid on;
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Respuestas (1)

Robert Brown el 18 de Abr. de 2021
Editada: Robert Brown el 18 de Abr. de 2021
Add these lines to the bottom of your code, to plot the desired value as a red asterisk on the existing plot with the other data plotted. Then reference the plot handle "p_include", from a legend request, to get a legend with only this plot data value included. string( R) converts R to a string and assigns it as a name for the plot which plots it on the figure.
p_include = plot(C,R,'r*','DisplayName',string(R))
legend(p_include)
chances are, your added plot of C,R was being plotted as a tiny line segment, but you just couldn't see it on your plot since it only had 1 data point.
The red asterisk will make the data point show up more clearly on your plot, and the legend will contain the numerical value R of the max value
I hope this helps ! :-)
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Robert Brown el 18 de Abr. de 2021
check update in original answer above...
Robert Brown el 18 de Abr. de 2021
Just click on the little "vote" tag by my answer

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