meshgrid or ngrid?

Question

ttopal 2016-8-9

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/298949-meshgrid-or-ngrid

回答： KSSV 2016-8-9

Hi, I have lately started to use meshgrid and ngrid thanks to the answer to my previous question. But I can not find a way to transform this code to either of them. Here on this code I have one calculationPoint, which normally has to be a meshgrid of -20:20 on both X and Y direction. Any suggestion on how to proceed would be appreciated.

clc;
S = 21;
t = linspace(-pi,pi,S);
knownPoints = [cos(t);sin(t)]; %(x,y)
f = exp(1i*t);
d = zeros (1,S);
calculationPoint = [10;9];
for idx=1:S    
            tmp1    = calculationPoint(1,1)-knownPoints(1,idx);
            tmp2    = calculationPoint(2,1)-knownPoints(2,idx);
            d(idx)  = sqrt(tmp1^2+tmp2^2); 
end
g = d.^2 + 1./d.^3;
z = 1/S*sum(g.*f); % z function is of parameter calculation point

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Answer 1

KSSV 2016-8-9

0
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https://ww2.mathworks.cn/matlabcentral/answers/298949-meshgrid-or-ngrid#answer_231242

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Your d, g are arrays of same size as t....You can use mesh grid on d/g... Are you looking for some thing like below?

clc;
S = 21;
t = linspace(-pi,pi,S);
knownPoints = [cos(t);sin(t)]; %(x,y)
f = exp(1i*t);
d = zeros (1,S);
calculationPoint = [10;9];
for idx=1:S    
            tmp1    = calculationPoint(1,1)-knownPoints(1,idx);
            tmp2    = calculationPoint(2,1)-knownPoints(2,idx);
            d(idx)  = sqrt(tmp1^2+tmp2^2); 
end
g = d.^2 + 1./d.^3;
[T,G] = meshgrid(t,g) ;
z = 1/S*sum(g.*f); % z function is of parameter calculation point