Matlab map with color representation module value size arrow

The quiver function that comes with matlab can draw arrow graphs. The length of the arrow corresponds to the magnitude of the modulus value of the vector.If you want to achieve the same length of arrows, first normalize the arrows, calculate the magnitude of the modulus of all arrows, calculate the scaling factor of each arrow, and then scale the vertical and horizontal components so that the modulus of all arrows are equal.Then divide the modulus value into 256 values ​​from large to small, and use the colormap matrix that comes with matlab to color the arrows in turn.
Look directly at the image: the left is the original image, the right is the adjusted image

Source code:

clc;close all;clear ;% construct dataload('wind','x','y','u','v')X = x(11:22,11:22,1);Y = y(11:22,11:22,1);U = u(11:22,11:22,1);V = v(11:22,11:22,1);%% default drawingfigurequiver(X,Y,U,V,'r')%% adjust drawingM=sqrt(U.^2+V.^2);% Calculated moduluscolorlist=jet;% load the color bar, you can also replace other, cool, winter, etc.Mdown=min(M(:));Mup=max(M(:));Mlist=linspace(Mdown,Mup,256);scaler1=Mup./M;% length adjustment factorU=U.*scaler1;% Adjust each componentV=V.*scaler1;% Adjust each componentscaler2=0.05;% rescale the length to fit the drawingU=U*scaler2;V=V*scaler2;figure[m,n]=size(X);for i=1:mfor j=1:nMtemp=abs(M(i,j)-Mlist);index=find(Mtemp==min(Mtemp));colorarrow=colorlist(index,:);q =quiver(X(i,j),Y(i,j),U(i,j),V(i,j),'MaxHeadSize',100);% Draw each one separately and adjust the size of the arrowq.LineWidth=1;q.Color=colorarrow;hold onendendhc=colorbar;colormap(jet)hc.TickLabels=linspace(Mdown,Mup,11);