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clc,clear

a = 3;

b = 4;

% pi/10 = 18 degrees & 9pi/10 = 162 degrees

O_int = pi/10;

O_fin = (9*pi)/10;

O_inc = pi/1000;

n_elem = ((O_fin-O_int)/O_inc)+1;

% Terpintine & Night Witches

for n = 1:n_elem

O(n) = O_int+(n-1)*O_inc;

x_1(n) = a*cot(O(n));

y_1(n) = b*sin(O(n))*cos(O(n));

x_2(n) = a*cot(O(n));

y_2(n) = a*(sin(O(n)))^2;

end

x = linspace(1:n_elem:30);

O(x) = O_int+(x-1)*O_inc;

X_1(x) = a*cot(O(x));

Y_1(x) = b*sin(O(x))*cos(O(x));

X_2(x) = a*cot(O(x));

Y_2(x) = a*(sin(O(x)))^2;

figure(1)

plot (x_1,y_1)

hold on

plot (x_2,y_2)

title ('Multiple Plots')

xlabel('Angle Measure')

ylabel('Amplitude')

legend('Serpintine', 'Witch of Agnesi')

figure(2)

plot (X_1,Y_1)

hold on

plot (X_2,Y_2)

title ('Multiple Plots')

xlabel('Angle Measure')

ylabel('Amplitude')

legend('Serpintine', 'Witch of Agnesi')

Geoff Hayes
on 25 Mar 2020

Mitch - there are a couple of errors around this block of code

x = linspace(1:n_elem:30);

O(x) = O_int+(x-1)*O_inc;

X_1(x) = a*cot(O(x));

Y_1(x) = b*sin(O(x))*cos(O(x));

X_2(x) = a*cot(O(x));

Y_2(x) = a*(sin(O(x)))^2;

x = linspace(1, 30, n_elem);

if you wish to create an array of n_elem elements in the interval [1,30]. This should fix the error

Error using linspace (line 19)

Not enough input arguments.

The second problem is with the next set of lines where you use x to index (?) into a handful of arrays. What is the intent here? Do you mean to do something more like

O = zeros(length(x),1);

X_1 = zeros(length(x),1);

X_2 = zeros(length(x),1);

Y_1 = zeros(length(x),1);

Y_2 = zeros(length(x),1);

for k = 1:length(x)

O(k) = O_int+x(k)*O_inc;

X_1(k) = a*cot(O(k));

Y_1(k) = b*sin(O(k))*cos(O(k));

X_2(k) = a*cot(O(k));

Y_2(k) = a*(sin(O(k)))^2;

end

I'm guessing though so perhaps you mean to do something else. Since these five arrays are of the same dimension, I might just create one array of dimension num_elemX5 rather than having five arrays.

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