Saving Loop Values to Array with Non-Integer Index

Question

Phillip Gyasi-Agyei 2020-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/523089-saving-loop-values-to-array-with-non-integer-index

评论： Phillip Gyasi-Agyei 2020-5-6

Hi All,

I'm trying to save the results of the iteration loop to an array for plotting, "r" and "x" specifically. My issue is that I can't figure out what to use as an index. My code is below, PLEASE HELP!

R = 0.6;
b = 0.1;
ro = R*b;
a = asind(b);
function [pl] = Geodesic(R, b, ro, a)
% This function plots a geodescic contour
% Initial Conditions
w = 0;
r = R;
x = 0;
Dr = 0;
Dx = 0;
Dw = 1;
hold on
for w = 0:Dw:90
    
    rm = r / ( cosd(w) * (2-tand(a).^2) );
    r(w) = r - Dr;
    x(w) = x + Dx;
    
    a = asind(ro/r);
    Dx = rm * Dw*cosd(w);
    Dr = rm * Dw * sind(w);
    
    pl = plot(r(w),x(w),'k.');
    title('Geodesic Dome Contour');
    xlabel('Distance From Center');
    ylabel('Y Position');
    
end
end

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Answer 1

KALYAN ACHARJYA 2020-5-5

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https://ww2.mathworks.cn/matlabcentral/answers/523089-saving-loop-values-to-array-with-non-integer-index#answer_430360

编辑：KALYAN ACHARJYA 2020-5-5

在 MATLAB Online 中打开

Make the r and x as output arguments in the function

function [pl,r,x] = Geodesic(R, b, ro, a)
% This function plots a geodescic contour
% Initial Conditions
w = 0;r = R;x = 0;Dr = 0;Dx = 0;Dw = 1;
hold on
for w = 0:Dw:90
    rm = r / ( cosd(w) * (2-tand(a).^2) );
    r(w) = r - Dr;
    x(w) = x + Dx;
    a = asind(ro/r);
    Dx = rm * Dw*cosd(w);
    Dr = rm * Dw * sind(w);
    pl = plot(r(w),x(w),'k.');
    title('Geodesic Dome Contour');
    xlabel('Distance From Center');
    ylabel('Y Position');
end
end

Now r and x will be reflected in workspace, now please do whatever you want

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KALYAN ACHARJYA 2020-5-5

编辑：KALYAN ACHARJYA 2020-5-5

在 MATLAB Online 中打开

Its the array, in each iteration generates single x and r values, it reflected as an array

%Like x=[6 7 9 -0........]

Modifications

function [pl,r,x] = Geodesic(R, b, ro, a)
% This function plots a geodescic contour
% Initial Conditions
w= 0;r(1)=R;x(1)= 0;Dr = 0;Dx = 0;Dw = 1;
hold on
for w = 2:Dw:90
    rm = r(w-1)/ ( cosd(w) * (2-tand(a).^2) );
    r(w) = r(w-1) - Dr;
    x(w) = x(w-1) + Dx;
    a = asind(ro/r(w));
    Dx = rm * Dw*cosd(w);
    Dr = rm * Dw * sind(w);
end 
    plot(r,x,'k.');
    title('Geodesic Dome Contour');
    xlabel('Distance From Center');
    ylabel('Y Position');
end