How to plot a triangle with functions in matlab

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Chloe
Chloe 2024-4-22
移动：Steven Lord 2024-6-18
Does this code work
xIN = 10;
yIN = 5;
xValuesArray = [];
yValuesArray = [];
for i=1:3
[xValuesArray(i) , yValuesArray(i)] = get2();
end
v(:,1)= xValuesArray'
v(:,2)= yValuesArray'
polyin = polyshape(v)
p = perimeter(polyin)
a = polyarea(xValuesArray, yValuesArray)
figure
hold on
plot([xValuesArray(1) xValuesArray(2)],[yValuesArray(1) yValuesArray(2)], ...
[xValuesArray(2) xValuesArray(3)],[yValuesArray(2) yValuesArray(3)], ...
[xValuesArray(3) xValuesArray(1)],[yValuesArray(3) yValuesArray(1)])
function [getX, getY] = get2()
getX = input("Give me a value for x\n");
getY = input("Give me a value for y\n");
end

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回答（2 个）

DGM
DGM 2024-4-22
移动：Steven Lord 2024-6-18
Ran in:
Using a bunch of input() calls has to be the most tedious and cumbersome way of getting a point list, but I suppose it works.
Also, since you created a polyshape, you can just plot it. You can also just get its area instead of using polyarea().
% a pointlist
xy = [0 0; 1 0; 0 1];
polyin = polyshape(xy);
p = perimeter(polyin)
p = 3.4142
a = area(polyin)
a = 0.5000
plot(polyin)
Animesh
Animesh 2024-6-18
Hi Chloe,
It has become really simple these days to quicky visulaize and implement our ideas through AI chat playground (https://in.mathworks.com/matlabcentral/playground/new).
I was able to implement your query with just one line. Attaching the screenshot for your reference:
Do check out the new MATLAB AI Chat Playground.
I hope this helps!
Animesh

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