Plotting loops, but only empty plot

Question

Katrina 2015-9-17

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/243515-plotting-loops-but-only-empty-plot

回答： Star Strider 2015-9-17

I'm trying to plot the information from my loops, but all I am getting is an empty plot. My code is as follows:

x1 = 1;
   while  x1<19;
    y1(x1)=x1^3-(5*x1)^2+2^x1-10000*x1;
    x1=x1+1;
   end
for x2=1:20
  y2(x2)=20000*log(x2)-3*x2;
  x2=x2+1;
end
%Create the plot
figure
   plot(x1,y1,'b-',x2,y2,'k-')

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Answer 1

Star Strider 2015-9-17

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/243515-plotting-loops-but-only-empty-plot#answer_192746

在 MATLAB Online 中打开

Add ‘x’ as an index to create your ‘x1’ vector, and specify x2 as a vector outside the loop:

x = 1;
   while  x<19;
    x1(x) = x;
    y1(x)=x1(x)^3-(5*x1(x))^2+2^x1(x)-10000*x1(x);
    x=x+1;
   end
for x2=1:20
  y2(x2)=20000*log(x2)-3*x2;
end
x2=1:20;
%Create the plot
figure
   plot(x1,y1,'b-',x2,y2,'k-')