Something wrong in the plotting

Hi every one,

why when I run the following code:

V1 = @(r,w) -acosh(10*(w/(1600*r + 21))^(1/2))/20000000000

V2 = @(r,w) acosh(10*(w/(1600*r + 21))^(1/2))/20000000000

% Define function to be integrated

fun = @(x,r,w)0.0018./((w./((cosh(10^10.*x./0.5)).^2)-(r.*16+0.21)).^0.5);

www = @(w,r)5.124+4*10^-6.*(exp(-215.6*0.5*(w.^(1/2)-(r.*16+0.21).^0.5))./(integral(@(x)fun(x,r,w),V1(r,w),V2(r,w))))-(exp(-37.45.*r).*(70.31));

fimplicit(www,[0 5 0 0.075],'MeshDensity',500, 'LineWidth',1.5),grid

I get something bizzare behind the actual plot desired, see the image attached! the bizzare thing is this dotted not continuous plot behind the smooth desired plot! how can I remove it? please!

Answer 1

[Torsten]

Only the continuous line is visible in Release R2022a.

V1 = @(r,w) -acosh(10*(w./(1600*r + 21)).^(1/2))/20000000000;
V2 = @(r,w) acosh(10*(w./(1600*r + 21)).^(1/2))/20000000000;
% Define function to be integrated
fun = @(x,r,w)0.0018./((w./((cosh(10^10.*x./0.5)).^2)-(r.*16+0.21)).^0.5);
www = @(w,r)5.124+4*10^-6.*(exp(-215.6*0.5*(w.^(1/2)-(r.*16+0.21).^0.5))./(integral(@(x)fun(x,r,w),V1(r,w),V2(r,w))))-(exp(-37.45.*r).*(70.31));
fimplicit(www,[0 5 0 0.075],'MeshDensity',500, 'LineWidth',1.5),grid

Warning: Function behaves unexpectedly on array inputs. To improve performance, properly vectorize your function to return an output with the same size and shape as the input arguments.

[Abdallah Qaswal]

Still, when I run the code , what I got is the same as the the plot I attached not the plot you attached !

Where is the problem?

[Abdallah Qaswal]

where do you think is the problem?

[David Meissner]

I'm also using release R2022a and it works fine for me.

The first thing that comes to mind is something is up with your graphics.

You might try this. (I'm assuming your using a windows machine here)

1. Restart your computer.
2. Open MATLAB, and type this in the command window:

fig = figure;
info = rendererinfo(gca)
info.GraphicsRenderer

3. If the returned object, info, has the property "GraphicsRenderer:" set to 'OpenGL Hardware', then make sure your hardware graphics driver is up to date which is vendor specific. (see: https://www.mathworks.com/help/releases/R2022a/matlab/creating_plots/resolving-low-level-graphics-issues.html)

3b. If the above commands don't work for you, you might have an older version of MATLAB, so try this...

info = opengl('data')
info.Software

If info.Software returns 0 or false, then you're using the hardware mode, verify your driver is up to date and/or move onto step 4.

4. If you still have the same issue, or tried updating the driver and you just gave up (no worries), type this in the command window to switch from hardware graphics to software graphics mode (for the current matlab session).

matlab -softwareopengl

5. If that works, set MATLAB to always use software mode by typing this in the command window

opengl('save','software')

6. Restart MATLAB.

7. If all that doesn't work, go back to the link in step 3, and go through it slowly and methodically, and see what else you can try.

8. If that doesn't work, call MathWorks Technical Support 508-647-7000

[Abdallah Qaswal]

Thank you for your response!but unfortunately none of these worked! But as you said it worked well in the new version but my old version 2018 did not!

[Torsten]

And why don't you use the new version ?

Or do you only refer to the graphics created with MATLAB online in R2022a ?

[Abdallah Qaswal]

I will get the new version as soon as possible and yes the online MATLAB provide the desired graphics! But you can not download or save the graphs from the online MATLAB, right? Is there any way to do so?