I want to plot a set of points satisfying certain condition. Although, there are many points in this set satisfying the given condition, the code I am using plots only the last point. Anyone can help me to plot all these points?

Question

Mohammad Ali 2017-12-21

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评论： Mohammad Ali 2017-12-23

 m=8;
for k=1:m;
         for n=1:m;
                 v=n+k;
               if v<= 7
                    plot(k,n,'b');
                    k
                    n
                    v
                else 
               end    
          end
 end

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Answer 1

Daniel Sahlin 2017-12-21

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Hi Mohammad Ali, You could probably just set a “hold on” statement after the plot, and change the style to e.g. ‘bo’ to get the individual points on the same graph.

plot(k,n,'bo'); hold on

It might however be worth considering saving k & n in vectors and making the plot after the loops depending on the application.

I hope it helps, Daniel

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Mohammad Ali 2017-12-23

Thanks a lot, it works

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Answer 2

Are Mjaavatten 2017-12-21

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在 MATLAB Online 中打开

You should specify a marker, since otherwise Matlab tries to plot a line between points. With only one point for each plot statement no line is drawn. Also, unless you instruct Matlab to "hold" the existing plot, the new plot command will clear the existing plot. Below, I have modified your code to use a ring ('o') as a marker.

m=8;
for k=1:m;
         for n=1:m;
                 v=n+k;
               if v<= 7
                    plot(k,n,'ob');
                    hold on
                else 
               end    
          end
 end