how to create shape on xy surface?
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Asliddin Komilov
am 14 Nov. 2023
Kommentiert: Asliddin Komilov
am 20 Nov. 2023
I need to calculate the area of shapes (parallelograms) that lay on one another. Their width is equal to 2. One of the angles (H) and the 'length' are variables (attached). So at the first I have created the list of the tasks:
- create the shape for the each case
- lay the shapes one on another
- and calculate the created shape's area
I have no idea how to do it, but looking into different options.
You are welcome to help with any of 3 tasks or with all of them.
I came accross with this
but I am still far away from understanding how to handle my task.
If it is simple for you, code it please, otherwise any hints and links to similar questions will be very helpful.
Thanks in advance.
2 Kommentare
Les Beckham
am 14 Nov. 2023
Bearbeitet: Les Beckham
am 14 Nov. 2023
Can you explain (preferably with a sketch) what you mean by "angles" and "length"?
Also, more than half of your length values are zero (see below).
S = load('variable.mat');
plot(S.H, '.')
hold on
grid on
plot(S.length(S.length ~= 0), '.')
Asliddin Komilov
am 17 Nov. 2023
Bearbeitet: Asliddin Komilov
am 17 Nov. 2023
Akzeptierte Antwort
Chunru
am 17 Nov. 2023
Bearbeitet: Chunru
am 20 Nov. 2023
websave("variable.mat", "https://www.mathworks.com/matlabcentral/answers/uploaded_files/1538662/variable.mat");
S = load('variable.mat');
% idx = S.H ~= 0 & S.length ~=0;
idx = S.length ~=0;
% Do computations only on the nonzero length and angle
S.H = 90 + S.H(idx)'; % check your definition of angle
S.length = S.length(idx)';
[S.H S.length]
min(abs(S.H)), max(abs(S.H))
whos
% create the shape for the each case
n = length(S.H)
w = 2;
S.X = [zeros(n,1) 2+zeros(n,1) S.length.*cosd(S.H)+2 S.length.*cosd(S.H)];
S.Y = [zeros(n,1) zeros(n,1) S.length.*sind(S.H) S.length.*sind(S.H)];
% lay the shapes one on another
figure
plot(S.X(:, [1:end 1])', S.Y(:, [1:end 1])') % plot all shapes
% plot shapes evry other 10
figure
plot(S.X(1:10:end, [1:end 1])', S.Y(1:10:end, [1:end 1])')
axis([-2 4 0 2])
% and calculate the created shape's area
S.A = abs(S.length.*w.*sind(S.H));
figure;
plot(S.A);
xlabel("Shape Index"); ylabel("Area")
7 Kommentare
Chunru
am 20 Nov. 2023
You have 108 shapes with length>0. The shape index (i from 1 to 108) is the reference to the i-th shape you have.
You can sum all the area by: sum(S.A)
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