matlab - How can I contour plot a custom function? -

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i have custom function returns either 0 or 1 depending on 2 given inputs:

function val = myfunction(val1, val2)    % logic determine if val=1 or val=0  end

how can create contour plot of function on x,y coordinates generated following meshgrid?

meshgrid(0:.5:3, 0:.5:3);

this plot display function 0 or 1 on contour map.

if function myfunction not designed handle matrix inputs, can use function arrayfun apply corresponding entries of x , y:

[x,y] = meshgrid(0:0.5:3);      %# create mesh of x , y points z = arrayfun(@myfunction,x,y);  %# compute z (same size x , y)

then use function contour generate contour plot above data. since z data has 2 different values, make sense plot 1 contour level (which @ value of 0.5, halfway between 2 values). might want instead use function contourf, produces color-filled contours show ones , zeroes are:

contourf(x,y,z,1);  %# plots 1 contour level, filling area on either                     %#   side different color


note: since plotting data has ones , zeroes, plotting contours may not best way visualize it. instead use function imagesc, so:

imagesc(x(1,:),y(:,1),z);

keep in mind y-axis in plot reversed relative plot generated contourf.


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