İnvisible plots and a error
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Ömer Fatih Özdemir
on 22 May 2022
Commented: Walter Roberson
on 24 May 2022
Guys what is wrong with my matlab codes? I could not take plots from first two figure and i take 'Array indices must be positive integers or logical values.' error from last two for loops.
clear;
clc;
y0=3;
x0=1:5;
for i=1:5
l(i)=sqrt(x0(i)^2+y0.^2);
Q(i)= atan(y0/x0(i));
end
plot(x0(i),l)
hold on
plot(x0(i),Q)
hold on
figure(1)
l1=3.5;
l2=3.5;
for a=1:5
q2(a)=acos((x0(a)^2+y0^2-l1^2-l2^2)/(2*l1*l2));
q1(a)=atan(y0/x0(a))-atan((l2*sin(q2)/(l1+l2*cos(q2))));
end
plot(x0(a),q1)
hold on
plot(x0(a),q2)
hold on
figure(2)
c2=45;
i1=2;
i2=3;
i3=1.5;
c1=0:180;
for k=0:180
x(k)=(i2+i3)*cos(c2)*cos(c1(k));
y(k)=(i2+i3)*cos(c2)*sin(c1(k));
z(k)=i1+(i2+i3)*sin(c2);
end
plot(c1(k),x)
hold on
plot(c1(k),y)
hold on
plot(c1(k),z)
hold on
figure(3)
i3_1=0.5:2;
c1_1=0:360;
for b=0:360
x(b)=(i2+i3_1)*cos(c2)*cos(c1(b));
y(b)=(i2+i3_1)*cos(c2)*sin(c1(b));
z(b)=i1+(i2+i3_1)*sin(c2);
end
plot(c1(b),x)
hold on
plot(c1(b),y)
hold on
plot(c1(b),z)
hold on
figure(4)
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Accepted Answer
Walter Roberson
on 22 May 2022
clear;
clc;
y0=3;
x0=1:5;
for i=1:5
l(i)=sqrt(x0(i)^2+y0.^2);
Q(i)= atan(y0/x0(i));
end
figure(1)
plot(x0, l, 'DisplayName', 'l')
hold on
plot(x0, Q, 'DisplayName', 'Q')
hold on
legend show
figure(2)
l1=3.5;
l2=3.5;
for a=1:5
q2(a)=acos((x0(a)^2+y0^2-l1^2-l2^2)/(2*l1*l2));
q1(a)=atan(y0/x0(a))-atan((l2*sin(q2)/(l1+l2*cos(q2))));
end
plot(x0, q1, 'DisplayName', 'q1')
hold on
plot(x0, q2, 'DisplayName', 'q2')
hold on
legend show
figure(3)
c2=45;
i1=2;
i2=3;
i3=1.5;
c1=0:180;
clear x y z
for k=0:180
x(k+1)=(i2+i3)*cos(c2)*cos(c1(k+1));
y(k+1)=(i2+i3)*cos(c2)*sin(c1(k+1));
z(k+1)=i1+(i2+i3)*sin(c2);
end
plot(c1, x, 'DisplayName', 'x')
hold on
plot(c1, y, 'DisplayName', 'y')
hold on
plot(c1, z, 'DisplayName', 'z')
hold on
legend show
figure(4)
i3_1=0.5:2;
c1_1=0:360;
clear x y z
for b=0:360
x(b+1,:)=(i2+i3_1)*cos(c2)*cos(c1_1(b+1));
y(b+1,:)=(i2+i3_1)*cos(c2)*sin(c1_1(b+1));
z(b+1,:)=i1+(i2+i3_1)*sin(c2);
end
plot(c1_1, x, 'DisplayName', 'x')
hold on
plot(c1_1, y, 'DisplayName', 'y')
hold on
plot(c1_1, z, 'DisplayName', 'z')
hold on
legend show
The last of those is a bit odd because your i3_1 is a vector consisting of [0.5, 1.5] since you have 0.5:2 but the default increment is 1.
In all of your other plots, the i3 or equivalent is a scalar; this is the only plot where it is a vector.
7 Comments
Walter Roberson
on 24 May 2022
for b=1:numel(c1_1)
x(b,:)=(i2+i3_1)*cos(c2)*cos(c1_1(b));
y(b,:)=(i2+i3_1)*cos(c2)*sin(c1_1(b));
z(b,:)=i1+(i2+i3_1)*sin(c2);
end
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