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Why isn't a line showing on my graph?

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Bella Finkel
Bella Finkel 2015-12-7
评论： Star Strider 2015-12-7
I tried graphing using plot(x, y, '-r') and it just put out a blank sheet. Is there something else I have to use to actually graph something?
  2 个评论
Geoff Hayes
Geoff Hayes 2015-12-7
Bella - no, there is nothing else that you need to do to plot your graph. What can you tell us about x and y. Are these scalars or arrays? Try plotting
plot(x,y,'ro')
instead as that will put a red circle at your coordinates and so will be easier to see.

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回答（1 个）

Walter Roberson
Walter Roberson 2015-12-7
Typically when that happens the person has the plot(x,y,'-r') in a loop with x and y being scalars. plot() will only create lines between the plots that are present in the same plot() call. The solution in such cases is to store the x and y values in a vector and do the plot after the loop.
for K = 1 : number_of_iterations
...
x_vector(K) = x;
y_vector(K) = y;
end
plot(x_vector, y_vector, '-r')

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