how to determine coordinate from graph

Question

Hao Ming Low 2020-3-24

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/512653-how-to-determine-coordinate-from-graph

评论： Star Strider 2020-3-24

i plotted a graph.

>> x = 0:1:20; 
>> y = (668.061./x).*[1-exp(-0.1468.*x)]-40;
>> plot(x,y) 

And i wanna determine the coordinate of x when y=0. (i want it be labelled on the graph). wht code should i put in?

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Answer 1

Star Strider 2020-3-24

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/512653-how-to-determine-coordinate-from-graph#answer_421748

在 MATLAB Online 中打开

Try this:

x = 0:1:20; 
y = (668.061./x).*[1-exp(-0.1468.*x)]-40;

Try this:

x = 0:1:20; 
y = (668.061./x).*[1-exp(-0.1468.*x)]-40;
Lv = ~isnan(y);                                     % Avoid ‘NaN’ Values
yq = 0;
xq = interp1(y(Lv), x(Lv), yq);                     % Interpolate To Find 'x' Value 'xq' Corresponding to 'yq'
figure
plot(x,y)
hold on
plot(xq, 0, 'r+')
hold off