My plot is not showing a line? Why?

37 次查看（过去 30 天）
Frederick Anokye
Frederick Anokye 2020-1-26
评论： Walter Roberson 2020-1-26
%Plot of net energy,attractive energy and repulsive energy of a two
%isolated ions seperated by a distance
% r is interatomic distance between the ions
clc; clear;
A=1.436; B=7.32*10^-6; n=8;
r = 0:0.1*10^-9:1*10^-9;
Net_Energy = zeros(length(r),1);
Attractive_Energy = zeros(length(r),1);
Repulsive_Energy = zeros(length(r),1);
for i=1:length(r)
Net_Energy(i) = -A/r(i) + B/r(i)^n;
Attractive_Energy(i) = -A/r(i);
Repulsive_Energy(i) = B/(r(i)^n);
end
for i=1:length(r)
plot(r(i),Net_Energy(i),'g')
hold on
plot(r(i),Attractive_Energy(i),'g')
hold on
plot(r(i)*10^9,Repulsive_Energy(i),'g')
hold on
end

请先登录，再回答此问题。

回答（3 个）

Eddie
Eddie 2020-1-26
Replace this
for i=1:length(r)
plot(r(i)*10^9,Net_Energy(i),'g')
hold on
end
with
f=figure; ax=axes(f);
plot(ax,r*10^9,Net_Energy,'g');
If you want to plot a line, the data need to be a single input to plot function instead of using a for loop, which would only plot your data points as individual points.
  2 个评论
Frederick Anokye
Frederick Anokye 2020-1-26
I have edit my code check again and comment
Eddie
Eddie 2020-1-26
Remove the for loop, use this instead
plot(r,Net_Energy,'g')
hold on %only need to do it once
plot(r,Attractive_Energy,'g')
plot(r*10^9,Repulsive_Energy,'g')
However, the last plot (Repulsive_Energy) won't appear with the other plots in the same region (since ther previous two plots are in region r, while the last one is in region r*10^9. I suspect this is what you want -
plot(r*10^9,Net_Energy,'g')
hold on %only need to do it once
plot(r*10^9,Attractive_Energy,'g')
plot(r*10^9,Repulsive_Energy,'g')

请先登录，再进行评论。

Walter Roberson
Walter Roberson 2020-1-26
Remove the plotting loop and use
plot(r*10^9,Net_Energy,'g')
Frederick Anokye
Frederick Anokye 2020-1-26
Thanks!
How can I make the lines curvy
  2 个评论
Walter Roberson
Walter Roberson 2020-1-26
use semilogy() instead of plot() to make the lines curvy.
To label the lines, use legend()

请先登录，再进行评论。

类别

在 Help Center 和 File Exchange 中查找有关 Lighting, Transparency, and Shading 的更多信息

标签

产品

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!

Translated by