Hello Nafiz
The “quiver” function in MATLAB does not natively support color coding based on vector magnitude. However, you can achieve this by plotting each vector individually and setting the color according to its magnitude. You can follow a similar approach for the custom magnitude.
[x,y] = meshgrid(-pi:pi/8:pi,-pi:pi/8:pi);
vx = sin(y);
vy = cos(x);
magnitude = sqrt(vx.^2 + vy.^2);
magnitude_normalized = (magnitude - min(magnitude)) ./ (max(magnitude) - min(magnitude));
cmap = jet(256);
figure;
hold on;
for i = 1:length(x)
for j=1:length(y)
% Determine color index
color_idx = round(magnitude_normalized(i,j) * (length(cmap) - 1)) + 1;
% Plot vector with color
quiver(x(i,j), y(i,j), vx(i,j), vy(i,j),1, 'Color', cmap(color_idx, :));
end
end
hold off;
colorbar;
colormap(cmap);
This produces the following output
