vector field with the corresponding lon and lat superimposed with contourf

Dear,

I have two sets of data vector (A) and the other one is a matrix (B) with the corresponding longitude and latitude. How can I plot the point data superimposed with the m_contourf plot with the same color for points with the exactly contourf colormap. Thank you in advance for your information and help.

A = [NaN, 20, NaN, 35, 15]; lonA = [31, 25, 36, 39, 40]; latA = [39, 33, 34, 41, 42];

B=(m*n); lonB(m*n); latB(m*n);

The code below I know does not work properly and is not what I expect.

>>figure

>>m_proj('mercator','lon',[lonmin lonmax],'lat',[latmin latmax]);

>>m_contourf(lonB,latB,B);

>>hold on

>>scatter(lonA,latA,pointsize,A)

>>hold off