Error with using fminsearch

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Berenice Oseguera
Berenice Oseguera el 22 de Dic. de 2019
Comentada: Berenice Oseguera el 23 de Dic. de 2019
I am working on finding the point that is the closest to 15 locations (minimum distance from all). The x- and y-coordinates are stored in 2 variables. I created the function and extracted the scalar variables from the vector but I am getting an error stating that there are not enough input arguments. The function definition and code are below:
function distance=mindistance(xv)
x=xv(1);
y=xv(2);
% extracting scaler variables from vector in fminsearch
sources = readtable('Data.xlsx','Sheet','PROJECT');
xcoordinates=table2array(sources(:,3));
ycoordinates=table2array(sources(:,4));
distance=sqrt(((x-xcoordinates).^2)+((y-ycoordinates).^2));
end
point to start with for fminsearch
xvg=[-2000 1500];
[xvmin,minD]=fminsearch(mindistance,xvg);

Respuesta aceptada

Walter Roberson
Walter Roberson el 22 de Dic. de 2019
Editada: Walter Roberson el 22 de Dic. de 2019
For one definition of "minimum distance from all":
function [xvmin, minD] = mindistance_driver
sources = readtable('Data.xlsx','Sheet','PROJECT');
xcoordinates = sources{:,3};
ycoordinates = source{:,4};
xvg=[mean(xcoordinates), mean(ycoordinates)];
[xvmin, minD]=fminsearch( @(x) mindistance(x, xcoordinates, ycoordinates), xvg);
end
function distance = mindistance(xv, xcoordinates, ycoordinates)
x=xv(1);
y=xv(2);
distance = sum( sqrt(((x-xcoordinates).^2)+((y-ycoordinates).^2)) );
end
There are other definitions that can be computed much more efficiently. In particular, if you use
distance = sqrt( sum( ((x-xcoordinates).^2)+((y-ycoordinates).^2) ) );
then you can demonstrate that mean(x) and mean(y) are the optimal coordinates, without needing to do any searching.

Más respuestas (1)

per isakson
per isakson el 22 de Dic. de 2019
Editada: per isakson el 22 de Dic. de 2019
Replace
[xvmin,minD]=fminsearch(mindistance,xvg);
by
[xvmin,minD]=fminsearch('mindistance',xvg);
or
[xvmin,minD]=fminsearch(@mindistance,xvg);
  5 comentarios
per isakson
per isakson el 22 de Dic. de 2019
Editada: per isakson el 22 de Dic. de 2019
I try to help OP find his/her programming mistakes. To that end I believe that reading documentation and the debugging process are important.
Berenice Oseguera
Berenice Oseguera el 23 de Dic. de 2019
Thank you!

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