Plot starts at 1

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Benedikt Schumacher
评论： Stephane Dauvillier 2022-9-20
Hello everyone,
I have a plot what starts at one instead of zero.
Can someone tell me were my fail is?
B=app.BEditField.Value;
C=app.CEditField.Value;
D=app.DEditField.Value;
E=app.EEditField.Value;
x = linspace(0,pi,100);
y=D*sin(C*atan(B*x-E*(B*x-atan(B*x))));
plot(app.UIAxes,y);
app.UIAxes.YLim = [-0.2 (D+0.2)];
app.UIAxes.XLim = [-10 100];

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回答（1 个）

Stephane Dauvillier
Hi you should use x and y in the plot command:
plot(app.UIAxes,x,y)
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Steven Lord
Steven Lord 2022-9-19
That is correct. For an explanation, from the Description section on the plot documentation page:
"plot(Y) plots Y against an implicit set of x-coordinates.
  • If Y is a vector, the x-coordinates range from 1 to length(Y).
  • If Y is a matrix, the plot contains one line for each column in Y. The x-coordinates range from 1 to the number of rows in Y."
In this case, app.UIAxes is not X data (which would cause MATLAB to use the plot(x, y) syntax.) It is recognized as an axes so the first syntax in Additional Options is used, then the remaining input is interpreted as Y data using the syntax above.
Stephane Dauvillier
Stephane Dauvillier 2022-9-20
your plot with x is the right one.The limits of the axes are not what you want but the data are well drawed.
ANd you can use the function below to set the limit of axes
xlim(app.UIAxes,[-10,100])
ylim(app.UIAxes,[-0.2,0.2+D])

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