MATLAB: How to plot scatter graph with colourmap functon

heatmap

Hi,
I have this 3 column matrix, where:
column 1 = x values
column 2 = y values
columnn 3 = value of each given point
myVal = [0	21	1.07	;
0	60	0.51	;
0	81	0.74	;
0	102	0.84	;
0	151	0.96	;
0	201	1.26	;
0	300	1.08	;
0	387	1.31	;
0	501	1.44	;
0	589	1.4	;
0	693	1.39	;
0	792	1.25	;
0	889	1.16	;
0	990	1.07	;
0	1185	1.21	;
0	1384	1.14	;
0	1582	1.44	;
0	1778	1.42	;
0	1976	0.69	;
0	2466	1.04	;
0	2957	1.64	;
0	3201	0.94	;
0	3521	0.82	;
48.8	19	1.01	;
48.8	37	0.37	;
48.8	50	0.47	;
48.8	75	0.63	;
48.8	99	0.75	;
48.8	119	0.57	;
48.8	137	3.04	;
74.8	21	0.73	;
74.8	39	0.34	;
74.8	71	0.52	;
74.8	149	0.6	;
74.8	200	0.89	;
74.8	300	0.56	;
74.8	398	0.74	;
74.8	496	0.81	;
74.8	596	0.86	;
74.8	694	1.03	;
74.8	792	0.85	;
282.7	15	0.12	;
282.7	54	0.19	;
282.7	80	0.18	;
282.7	100	0.24	;
282.7	199	0.29	;
282.7	497	0.56	;
282.7	695	0.76	];
How would I adapt this data to work for this scatter heatmap function:
cmap = jet(256); %state colourmaop
v = rescale(myVal, 1, 256);
numVal = length(myVal)
markerColors = zeros(numVal, 3)
% Now assign marker colors according to the value of the data.
for k = 1 : numVal
    row = round(v(k));
    markerColors(k, :) = cmap(row, :);
end
% Create the scatter plot.
scatter(x, y, [], markerColors);
grid on;
Charlie

Best Answer

Try this
x = myVal(:,1);
y = myVal(:,2);
z = myVal(:,3);
cmap = jet(256); %state colourmaop
min_val = min(z);
max_val = max(z);
colors = interp1(linspace(min_val, max_val, 256), cmap, z);
scatter(x, y, [], colors);
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