Why doesn't anything show up on my plot?

Question

Liam Swift 2018-4-23

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396688-why-doesn-t-anything-show-up-on-my-plot

评论： Star Strider 2018-4-23

 clear all;
 clc;
 Fi=1000;
 Se= 50;
 Su= 450;
 C= 2/3;
 nf=[];
 for D=2:01:6;
    A= 0.25*pi*(D)^2;
    siga= ((C*3662.5+Fi)-(C*1000+1000))/2*A;
    sigm= ((C*3662.5+Fi)+(C*1000+1000))/2*A;
    sigi= sigm-siga;
    nf= (Se*(Su-sigi))/(siga*(Su+Se));
 end
 figure(1)
 D=2:6
 plot(D,nf)
 xlabel('D');
 ylabel('nf');

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Answer 1

Star Strider 2018-4-23

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/396688-why-doesn-t-anything-show-up-on-my-plot#answer_316616

在 MATLAB Online 中打开

Define ‘D’ before the loop, and subscript ‘nf’ in the loop:

Fi=1000;
Se= 50;
Su= 450;
C= 2/3;
nf=[];
D=2:01:6;
for k = 1:numel(D)
    A= 0.25*pi*(D(k))^2;
      siga= ((C*3662.5+Fi)-(C*1000+1000))/2*A;
      sigm= ((C*3662.5+Fi)+(C*1000+1000))/2*A;
      sigi= sigm-siga;
      nf(k)= (Se*(Su-sigi))/(siga*(Su+Se));
  end
figure(1)
plot(D,nf)
xlabel('D');
ylabel('nf');