Error using str2num (line 32), Requires string or character array input. Error in xGridMarkers = str2num(ge​t(gca,'XTi​cklabel'))​; how to remove this error??

xyRange=[1,5];      %// Starting xy range of particles 
P=3;             %// Number of particles generated each day
vx=0.6; vy=0.4;%// x and y velocity
al=35;at=5;t=1;
X=[]; Y=[];         %// Vectors start out empty
for day=1:5
   %// Generate 3 particles and add to end of vectors X and Y
   X=[X;randi(xyRange,P,1)]; 
   Y=[Y;randi(xyRange,P,1)]; 
   %// Move all the particles
   X=X+vx+randi([-6,6],1,1)*sqrt(2*al*vx*t)+randi([-6,6],1,1)*sqrt(2*at*vy*t);
   Y=Y+vy+randi([-6,6],1,1)*sqrt(2*al*vy*t)+randi([-6,6],1,1)*sqrt(2*at*vx*t);
end

plot(X,Y,'kd');grid on;
xGridMarkers = str2num(get(gca,'X'));
yGridMarkers = str2num(get(gca,'YTickLabel'));
numXSquares = length(xGridMarkers) - 1;
numYSquares = length(yGridMarkers) - 1;
squareHitCount = zeros(numYSquares, numXSquares);
for k=1:size(X,1)
     x = X(k);
     y = Y(k);
     ySqrIdx  = numYSquares - (find(yGridMarkers>y,1) - 1) + 1; 
     xSqrIdx  = find(xGridMarkers>x,1) - 1; 
     squareHitCount(ySqrIdx, xSqrIdx) = squareHitCount(ySqrIdx, xSqrIdx) + 1;
end

[Guillaume]

If you're asking help about an error, post the entire error message as it appears on screen, particularly the part that states where the error occurs.

[sneha kriplani]

i have done that now.

Answer 1

[Azzi Abdelmalek]

Use str2double, because get(gca,'XTicklabel') is a cell array

xGridMarkers = str2double(get(gca,'XTicklabel'));
yGridMarkers = str2double(get(gca,'YTickLabel'));

[sneha kriplani]

@azzi if i need to find out x and y coordinate of center of each grid box then how to do ?? please help.Thnaks in advance