Matrix dimensions must agree error problem

2021 8 2
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更新时间：2021 8 2
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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)

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回答（1 个）

James Tursa
James Tursa 2021-8-2

0 个投票

Use element-wise division with the dot:
Y=acosd(sin(altitude)*sin(latitude)-sin(declination)./(cos(altitude)*cos(latitude)));

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ibrahim alzoubi
ibrahim alzoubi 2021-8-2
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
ibrahim alzoubi 2021-8-2
Matrix dimensions must agree. ERORR
James Tursa
James Tursa 2021-8-2
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
ibrahim alzoubi 2021-8-2
I'm looking to gerate 2D matrix where w represents hours (24 hour)
James Tursa
James Tursa 2021-8-2
编辑：James Tursa 2021-8-2
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?

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