Plotting on a curved surface

Question

Griffin Polglaze 2020-7-24

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/569890-plotting-on-a-curved-surface

回答： Pratheek Punchathody 2020-8-31

This question may be a bit vague but is there anyway to plot these droplets (i.e. the red dots) on a curved surface. All coordinates are in polar form but regarding the plotting surface I'm not sure if there's any way to change it. I have attached a picture of the plot and my code, if anyone is able to suggest any ideas it would be appreciated!

a='.txt';
load('MyColormaps.mat','mycmap');
for i=500
    
    str=int2str(i);
    stp= strcat(str,a);
    stp
    c=load(stp,'w+');
    s=size(c)
    s1=s(1,1)
    s2=s(1,2)
    %b=zeros(s1,s1);
    b=zeros(500,500);
     %S2=sqrt(s1);
    %b=zeros(S2,S2);
    for ii=1:s1
        x(ii,1)=c(ii,1);
        y(ii,1)=c(ii,2);
        r(ii,1)=c(ii,3);
        [radial,theta] = cart2pol(x,y);
    end
    
     k=0;
    for j=1:s1
        if(r(j)>=0.005)
            k=k+1;
            rnew(k,1)=r(j);
            xnew(k,1)=x(j,1);
            ynew(k,1)=y(j,1);
            
            [radialnew,thetanew] = cart2pol(xnew,ynew);
            
        end
    end
        
    S1=k
      for l=1:S1
        xo=xnew(l,1);
        yo=ynew(l,1);
        R=rnew(l,1);
        [radialo,thetao] = cart2pol(xo,yo);
        
        for m1=1:1000
            m=m1*10/1000;
            for n1=1:1000
                n=n1*10/1000;
                if(((radialo-m)^2+(thetao-n)^2)^0.5)<=R 
                    b(m1,n1)=1;
                end
            end
        end
        l
    end
    figure(i);
    bas=figure(i);
    imagesc(b);
   axis([0 1000 0 160]);
    axis square;
    colormap(jet);
   set(bas,'Colormap',mycmap);
   print ('-dtiffn',sprintf('%d.tif',bas));
   close all;
  
    
end 

3 个评论
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KALYAN ACHARJYA 2020-7-24

What type of surface plot you are looking for, please see surf , any pictorial representation?

Griffin Polglaze 2020-7-24

It is a 2D shape i.e. r, theta so I don't think surf will be correct to use

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Answer 1

Pratheek Punchathody 2020-8-31

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/569890-plotting-on-a-curved-surface#answer_487307

Hi,

As all the data are in the polar coordinates (i.e. r and theta) the best possible way to visually represent the data is using the “polarplot()” which is in the 2D form.