What function to use to quantize a variable

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Shawn
Shawn 2022-2-9
评论： Shawn 2022-2-10
I think this is a fairly simple problem but not sure what Matlab function to use. I have several variables calculated in normal double precision. They are signed and symetrically bounded between a speficied negative and positive value. I need to "quantize" the variables so that they have a resolution of one part in 64 (6 bit) or one part in 128 (7 bit) resolution between the upper and lower bounds. The output should be a normal double percision variable but "quantized" as described. Not sure what Matlab function(s) or scripts to use.
I do not have any additional tooboxes so need to solve within basic Matlab.
Thanks

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回答（1 个）

David Hill
David Hill 2022-2-9
Something like this.
x=100*rand(1000,1)-50;
h=linspace(-50,50,129);%for 128 resolution
[~,~,bin]=histcounts(x,h);
q=x(bin);
  1 个评论
Shawn
Shawn 2022-2-10
Dave,
Thanks. Not exactly what I was looking for but enough to set me on the correct path. The script below solves my problem. In the example, I'm taking a variable that spans a range from -5 t0 5 and quantizing into 64 levels. The behavior around zero is particularly what I wanted.... output is zero around zero.
x=linspace(-5,5,10000); % Create vector for example
q = 10/64; % Set quantization = input range/desired quantization
y = q * round(x/q); % This accomplishes the quantization
scatter(x,y) % Show results. Zoom in to see results
grid on

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