Color Proportional to Height in Scatter3()

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Daniel
Daniel 2011-8-4
I am plotting data points in scatter3. The x and y coordinates are the location of a mirror, and the z value is the signal strength at that point. It ranges from 0 to 384.
I am trying to create a color array the same length as the data to be graphed in order to have different colors for the different heights. Right now I have this:
color=cell(384,1);
for j=1:384
if (signal{j} <40)
color(j)='r';
elseif (signal{j} >= 40) && (sigal{j} <100)
color(j)='g';
elseif signal{j} >=100
color(j)='b';
end
end
Basically I am trying to check the height of the point and based on the height, put a color code into a 384x1 array. However I keep getting this error code:
Cell contents reference from a non-cell array object. (It also points to this part:
if (signal{j} <40)
I am not sure why. The signal is a 384x1 double array.
Any help would be wonderful!

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采纳的回答

Walter Roberson
Walter Roberson 2011-8-4
pointsize = 8;
[counts, ccode] = histc(signal,[-inf, 40, 100, inf])
scatter3(x,y,signal,pointsize,ccode(:));
colormap([1 0 0;0 1 0; 0 0 1]);

更多回答（1 个）

Daniel
Daniel 2011-8-4
Ok...I got this to work...messed with the formatting and stuff,
but now it doesnt like a colormap of the data. It says
Array must be numeric or logical.
My formatting for scatter3 is
scatter3(x,y,z,colormatrix)
where colormatrix is a 385x1 matrix with entries of 'r','g','b'
sorta like {'r','g'.....}
Any ideas?

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