Plotting of null surfaces and Warning: Matrix is singular to working precision.
2 views (last 30 days)
Show older comments
Problem: I have the following three sets of equation which i need to plot as planes in 3D system.
I ,N and T are there variables representing the null surfaces .Now i don't have to solve them, instead i just have to plot them as planes and see their intersections. Here is the plot i am supposed to get,
My attempt: I tried to use meshgrid and surf to plot the plane but i don't understand how to proceed with the first two. The third one i tried like
[T N] = meshgrid(0:0.01:5);
I= (0.33*(0.3+T))/((T+0.2)*(0.3+T)-0.01*T);
surf(T,N,I);
This led me to a warning: Matrix is singular to working precision. I checked if somewhere the denominator vanishes but they don't.
For the second i tried:
[I N] = meshgrid(0:0.01:5);
T= 1-I/3-N/1.5;
surf(I,N,T);
But again this did give something but nothing like the above figure. I could be completly wrong with my attempt here, hence any guidance or a small code will be extremely helpful. The variable I, T, and N are Immune, Tumor and Normal in the above figure.
Thank you.
3 Comments
David Goodmanson
on 22 Dec 2019
Hi Vira,
I don't believe the second and third equations correspond to the figure in your question. For the third equation, if you plug in T = 0 you get 1.5 for any N, but the figure shows 5. For the second equation, if you plug in N=0 T=0 you get 3, but the figure (up from the back corner where you can't actually see the origin T=0,N=0) shows 9.
Answers (0)
See Also
Categories
Find more on Surface and Mesh Plots in Help Center and File Exchange
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!