Why am I getting zeros

1 次查看（过去 30 天）
olivia
olivia 2023-8-31
评论： Voss 2023-8-31
%Latty:
38
39
37
40
39
36
39
39
38
40
35
37
38
40
40
37
36
36
39
36
40
35
39
35
39
39
35
38
39
38
37
36
35
37
39
40
36
39
39
38
38
36
36
38
36
36
38
35
40
36
36
36
36
37
38
39
36
35
38
40
36
32
Latty=LLARYP.Lat;
a=6378137; %meters
b=6356752; %Meters
fprintf ("Prime Vertical Radius of Curvature\n");
i = 1;
sz = size(Latty);
while i <= sz(1)
Rn(:,1)=(a^2)/(sqrt((a^2)*(cosd(Latty).^2)+(b^2)*(sind(Latty).^2)));
i = i + 1;
end
fprintf("Rn =");
disp (Rn)
%Output
Prime Vertical Radius of Curvature
Rn = 1.0e+06 *
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
6.3841
%%The output I get

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采纳的回答

Voss
Voss 2023-8-31
Ran in:
Latty = [38; 39; 37; 40; 39; 36; 39; 39; 38; 40; 35; 37; 38; 40; 40; 37; 36; 36; 39; 36; 40; 35; 39; 35; 39; 39; 35; 38; 39; 38; 37; 36; 35; 37; 39; 40; 36; 39; 39; 38; 38; 36; 36; 38; 36; 36; 38; 35; 40; 36; 36; 36; 36; 37; 38; 39; 36; 35; 38; 40; 36; 32];
a=6378137; %meters
b=6356752; %Meters
Your while loop doesn't appear to be necessary; it's performing the exact same calculation multiple times. Maybe you meant this:
i = 1;
sz = size(Latty);
while i <= sz(1)
Rn(i,1)=(a^2)/(sqrt((a^2)*(cosd(Latty(i)).^2)+(b^2)*(sind(Latty(i)).^2)));
i = i + 1;
end
disp(Rn)
1.0e+06 * 6.3862 6.3866 6.3859 6.3870 6.3866 6.3855 6.3866 6.3866 6.3862 6.3870 6.3852 6.3859 6.3862 6.3870 6.3870 6.3859 6.3855 6.3855 6.3866 6.3855 6.3870 6.3852 6.3866 6.3852 6.3866 6.3866 6.3852 6.3862 6.3866 6.3862 6.3859 6.3855 6.3852 6.3859 6.3866 6.3870 6.3855 6.3866 6.3866 6.3862 6.3862 6.3855 6.3855 6.3862 6.3855 6.3855 6.3862 6.3852 6.3870 6.3855 6.3855 6.3855 6.3855 6.3859 6.3862 6.3866 6.3855 6.3852 6.3862 6.3870 6.3855 6.3841
However, you can do the same thing without a loop. (Use ./ for element-wise division.)
Rn = a^2./sqrt(a^2*cosd(Latty).^2+b^2*sind(Latty).^2);
disp(Rn)
1.0e+06 * 6.3862 6.3866 6.3859 6.3870 6.3866 6.3855 6.3866 6.3866 6.3862 6.3870 6.3852 6.3859 6.3862 6.3870 6.3870 6.3859 6.3855 6.3855 6.3866 6.3855 6.3870 6.3852 6.3866 6.3852 6.3866 6.3866 6.3852 6.3862 6.3866 6.3862 6.3859 6.3855 6.3852 6.3859 6.3866 6.3870 6.3855 6.3866 6.3866 6.3862 6.3862 6.3855 6.3855 6.3862 6.3855 6.3855 6.3862 6.3852 6.3870 6.3855 6.3855 6.3855 6.3855 6.3859 6.3862 6.3866 6.3855 6.3852 6.3862 6.3870 6.3855 6.3841

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