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How to plot a repeated y value after some interval vaue of x?

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seble mekonnen
seble mekonnen 2018-1-26
评论： Walter Roberson 2018-1-26
I have (x,y) data but I want to repeat the y value after each multiple of 9 up to the last value of xn, i.e x= 100. I expect a triangular shape with touching at x =[1 9 18 29 etc ] . i tried with the following code but not effective , any one who can show my error . thanks
y=[1 2 3 4 5 4 3 2 1]
x=[1 2 3 4 5 6 7 8 9]
xn=ones(1,100);
j = 1;
for i = 1:length(xn)
if(j==10)
j = 1;
end
if i<=5
y(i)=i;
else
y(i)=y(5)-y(i-5);
end
j = j+1;
plot(x(i), y(j));
end
error
Index exceeds matrix dimensions.

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回答（1 个）

Walter Roberson
Walter Roberson 2018-1-26
for i = 1:length(xn)
...
plot(x(i), y(j));
for that plot to work, length(x) must be at least length(xn) . But length(xn) is 100, and length(x) is 9.
I do not see any use for xn except to provide length() for the for i loop. Why not just directly code for i = 1 : 100 ?
  2 个评论
seble mekonnen
seble mekonnen 2018-1-26
yes, right but I want to use xn for any arbitrary size, for instance for simulation time of xn. and to plot the (x,y)
Walter Roberson
Walter Roberson 2018-1-26
Then perhaps you want
plot(xn(i), y(j), '*');
hold on;
However, all of your xn are 1, so it is not clear this is what you want.

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