i have a problem with my plot, i am not getting any values and the system gives me an empty plot.

Question

Ammar Anayi 2021-10-10

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1528786-i-have-a-problem-with-my-plot-i-am-not-getting-any-values-and-the-system-gives-me-an-empty-plot

回答： John D'Errico 2021-10-10

采纳的回答： John D'Errico

在 MATLAB Online 中打开

a = 0;5;

i0H2 = 10^(-7);

i0Zn = 10^(-5);

C = 7;

R = 8;314;

T = 298;15;

F = 96485;

E0H2 = -0;83;

E0Zn = -1;27;

n = [-1,1];

EH2 = n + E0H2;

EZn = n + E0Zn;

iH2 = @(n)(i0H2 *( exp((a*F*n)/(R*T)) - exp((-a*F*n)/(R*T)))) ;

iZn = @(n) (i0Zn * (exp((a*F*n)/(R*T)) - exp((-a*F*n)/(R*T))));

Log_iH2 = log10(iH2(n));

Log_iZn = log10(iZn(n));

plot(Log_iH2, EH2)

hold on

plot(Log_iZn, EZn)

hold on

3 个评论
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Ammar Anayi 2021-10-10

how do i resolve the problem, what should i do with the code.

Matt J 2021-10-10

编辑：Matt J 2021-10-10

Matlab is calculating what you asked it to. We cannot know what you really intended to calculate.

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Answer 1

John D'Errico 2021-10-10

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1528786-i-have-a-problem-with-my-plot-i-am-not-getting-any-values-and-the-system-gives-me-an-empty-plot#answer_805436

在 MATLAB Online 中打开

Look at what you did.

a = 0;5;

First, maybe you think this creates a vector in a? Instead, it just sets a to 0. Then it dumps 5 into the bit bucket.

i0H2 = 10^(-7); 
i0Zn = 10^(-5); 
C = 7; 
R = 8;314; 
T = 298;15; 
F = 96485;
E0H2 = -0;83; 
E0Zn = -1;27; 

Again, I wonder if you understand that just dumps the second number after the semi-colon into the bit bucket?

n = [-1,1]; 
EH2 = n + E0H2; 
EZn = n + E0Zn; 
iH2 = @(n)(i0H2 *( exp((a*F*n)/(R*T)) - exp((-a*F*n)/(R*T)))) ; 
iZn = @(n) (i0Zn * (exp((a*F*n)/(R*T)) - exp((-a*F*n)/(R*T)))); 
Log_iH2 = log10(iH2(n)) 
Log_iH2 = 1×2
  -Inf  -Inf
Log_iZn = log10(iZn(n))
Log_iZn = 1×2
  -Inf  -Inf