Invalid expression error with function!
显示 更早的评论
I am new to using a function, and I'm trying to make a function mydistance that will take user input of coordinates and then calculate the great circle distance on the surface of the earth between the coordinates. The equation is all in there, but I am getting an error on the part that asks for input. Any ideas? Thank you!
(I've been trying it using the input: 37N, 76W 37N, 9W)
function d = mydistance(a)
prompt = 'Input coordinates between which you want to find the great circle distance (XN, XW XN, XW): ';
getridof = ["N","W",","];
x = input(prompt)
x = split(replace(x,getridof," "));
a = acos(sin(x(1))*sin(x(3))+cos(x(1))*cos(x(3))*cos(abs(x(2))-x(4)));
d = a*.6371;
disp(['The great circle distance in km is: ',num2str(d)])
end
回答（1 个）
Star Strider
2019-2-28
Read the coordinates as a string, then do the conversions:
prompt = 'Input coordinates between which you want to find the great circle distance (XN, XW XN, XW): ';
getridof = ["N","W",","];
xc = input(prompt, 's')
xc = split(replace(xc,getridof," "));
x = str2double(xc)
a = acos(sin(x(1))*sin(x(3))+cos(x(1))*cos(x(3))*cos(abs(x(2))-x(4)));
d = a*.6371;
disp(['The great circle distance in km is: ',num2str(d)])
This works, and with your desired inputds, produces:
The great circle distance in km is: 0.93002
when I run it.
类别
在 帮助中心 和 File Exchange 中查找有关 Event Functions 的更多信息
2019-2-28
2019-2-28
Community Treasure Hunt
Find the treasures in MATLAB Central and discover how the community can help you!
Start Hunting!
Translated by 
