Matrix dimensions must agree error problem

Hello everyone, I'm trying to plot this Code but it gives me an error: Matrix dimensions must agree

How can I sove the problem?

number_of_the_yearly_day = 1:1:365;
declination=23.45*sin((2*pi*(number_of_the_yearly_day-80))/(365));
latitude=31.963158;
Zenith_angle=latitude-declination;
tilt_angle=Zenith_angle;
altitude=1-Zenith_angle;  
T=0:1:24;
w=15*(12-T);
X=asind(sin(declination).*sin(latitude)+cos(latitude).*cos(declination).*cos(w));
Y=acosd(sin(altitude)*sin(latitude)-sin(declination)/(cos(altitude)*cos(latitude)));
plot (x,Y)

Answer 1

[James Tursa]

Use element-wise division with the dot:

Y=acosd(sin(altitude)*sin(latitude)-sin(declination)./(cos(altitude)*cos(latitude)));

[ibrahim alzoubi]

clc
clear all
number_of_the_yearly_day = 1:1:365; %n
T=1:1:24;
declination=23.45*sin((2*pi*(number_of_the_yearly_day-80))/(365));%𝛿
latitude=31.963158; %∅
Zenith_angle=latitude-declination; %𝜃𝑧
tilt_angle=Zenith_angle;%𝛽
altitude=1-Zenith_angle;  %α
w=15*(12-T);
X=asind(sin(declination).*sin(latitude)+cos(latitude).*cos(declination).*cos(w));
Y=acosd(sin(altitude).*sin(latitude)-sin(declination)./(cos(altitude).*cos(latitude)));
plot (X,Y)

like this? it still gives me an error

[ibrahim alzoubi]

Matrix dimensions must agree. ERORR

[James Tursa]

I just noticed the w. This is a different size than declination. What were you expecting the outcome of cos(declination).*cos(w) to be given the different sizes involved? Are you looking to generate a 2D matrix of results, or ...?

[ibrahim alzoubi]

I'm looking to gerate 2D matrix where w represents hours (24 hour)

[James Tursa]

Try turning the w part into a column vector and then use implicit expansion. E.g., cos(w'). Note that this results in X being a 2D matrix and Y being a 1D vector. Does that do what you want?