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Working with areas under the curve.

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César Hernández
编辑： César Hernández 2019-9-10
Hi all and greetings.
In the program, i have the graph of a function, and at least one activity ago was created before next abstracted code activity shown below, and the figure is in a variable called "h", the graph range is 0 to 30. In the next code or activity, the respective function of the graph is called "y" as is shown below.
I will get the area under the curve of this function in the range 10 to 20.
How to do to FILL this area range when I click on the figure or graph AND TO SHOW IN A LABEL THE AREA VALUE ?
Maybe a callback function or another idea !!!
CAN SOMEONE HELP ME PLEASE ?
THANKS !!!
a=input('First value: '); % a=10
b=input('Second value: '); % b=20
syms x
y=10*log(2+x^2)+(10/3*x);
area=eval(int(y,a,b));
disp(area);

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采纳的回答

David Hill
David Hill 2019-9-9
x=10:.1:20;%or whatever intervals you want
y=10*log(2+x.^2)+(10/3*x);
x=[10,x,20];
y=[0,y,0];
z=polyshape(x,y);
plot(z)
I am sure there is a better way, but I thought of just plotting a polyshape. I don't have too much experience in plotting in Matlab.
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César Hernández
César Hernández 2019-9-9
Hello, thanks for answering.
I will study both scopes for helpping me, that of your code and the polyshape function.
I am also contemplating the possibility of using maybe only the already existing figure.
I think other tips are not over. If no problem. And some of you can barely help me...
Thanks and regards.

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