hi i write this matlap code but when i plot it i get an empty graph

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shaker mahmood 2018-1-16

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回答： shaker mahmood 2018-1-16

vt=-7; w=0.47; L=0.025; m=1.22; c0=34.515e-9;k=(w*m*c0/(2*L));
for vg=0:10:40
          Id=k*(vg-vt).^2
  plot(vg,Id,'r');
  hold on;
end

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Answer 1

Walter Roberson 2018-1-16

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Change the 'r' to 'r*'

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shaker mahmood 2018-1-16

thank you for your help but why its only show a points while it has to be a curve

Walter Roberson 2018-1-16

You only ask it to plot one point at a time. MATLAB has no way of knowing that you want the points to be connected. If you want points to be connected in a plot then you need to give plot at least two points, the place to draw from and the place to draw to.

All of which is leading to the fact that you should not be plotting inside the loop. Instead you should be calculating the coordinates and storing them in a vector, and then you can plot the vector after the loop.

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