the plot is not appearing what should i fix ?

Question

poorya gholamnejad 2022-8-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1774260-the-plot-is-not-appearing-what-should-i-fix

回答： Walter Roberson 2022-8-5

 g=9.81;
            Flow = app.FlowEditField.Value;
            Width = app.WidthEditField.Value;
            q = Width/Flow;
            yc=(q^2/g)^(1/3);
            Criticaldepth = app.CriticalDepthEditField.Value; 
            app.CriticalDepthEditField.Value = [num2str(yc)];
            Depth = app.DepthEditField.Value;
 for i=1:length(Depth)
     E(i)=Depth(i)+q^2/(2*g*Depth(i)^2);
            plot(app.UIAxes,E,Depth,'r');
 end

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Answer 1

Walter Roberson 2022-8-5

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1774260-the-plot-is-not-appearing-what-should-i-fix#answer_1021405

在 MATLAB Online 中打开

 for i=1:length(Depth)
     E(i)=Depth(i)+q^2/(2*g*Depth(i)^2);
 end
 plot(app.UIAxes,E,Depth,'r');

However, the convention is that the independent variable (Depth in this case) should be on the horizontal axes (first data parameter) and that the dependent variable (E in this case) should be on the vertical axes. It will be confusing to people that you have those reversed.

Note: instead of the loop you could vectorize to

E = Depth + q^2 ./ (2*g*Depth.^2);