Index in position 1 is invalid. Array indices must be positive integers or logical values problem

Question

ibrahim alzoubi 2021-8-3

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/891192-index-in-position-1-is-invalid-array-indices-must-be-positive-integers-or-logical-values-problem

回答： Asaad Abboud Alkhalaf 2021-8-3

It gives me "Index in position 1 is invalid. Array indices must be positive integers or logical values."

How can I solve it

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));%?
latitude=31.963158; %?
Zenith_angle=latitude-declination; %??
tilt_angle=Zenith_angle;%?
altitude=1-Zenith_angle;  %?
w=15.*(12-T);
for i=1:365
    w(i,:)=w(i-1,:)+1
end
Y=acosd(sin(altitude).*sin(latitude)-sin(declination)./(cos(altitude).*cos(latitude)));
X=asind(sin(declination).*sin(latitude)+cos(latitude).*cos(declination).*cos(w));
plot (X,Y)