MATLAB: Recreate vector

for loopMATLABsparsevector

I have a compressed vector like this: a_compressed = [9 3 5] a_ending_indx = [4 6 9]

Without using FOR loop, what is the efficient way to uncompress that vector so that the full vector is a = [9 9 9 9 3 3 5 5 5]

Thanks, Sam

Best Answer

One of many ways:

a_c = [9 3 5];
a_x = [4 6 9];
B = zeros(1,a_x(end));
B([1 a_x(1:end-1)+1]) = 1;
C = a_c(cumsum(B))

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MATLAB: Recreate plot from image

You need to scale each parameter (MPG, Horsepower, etc.) by the maximum value of each parameter. I used repmat in my code so that the scaling could be done in a single line instead of a for-loop.

% Find maximum value for each variable
% Use repmat to allow for vectorization (faster computation)
column_max = repmat(max(data), size(data, 1), 1);
% Scale data so that max value for each variable = 1
data_scaled = data./column_max;
h = figure();
set(h,'DefaultAxesColorOrder',[1 0 0; 0 1 0; 1 1 0; 1 0 1; 0 0 1]);
lineobjects = parallelcoords(data_scaled,'Group',Cylinders,'Labels',labels);

The code above will produce the following figure (not an exact replica of the figure you sent, but you can mess around with annotations and axis labels):

Hope this helps!

Best Answer

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