MATLAB: Can’t downsample a matrix

Question

the downsample function downsample only the rows

for example:

y =

    0.5377   -0.1241   -1.0689    1.0933
   -2.2588    1.4090   -2.9443   -0.8637
    0.3188    0.6715    0.3252   -1.2141
   -0.4336    0.7172    1.3703   -0.0068

>> a=downsample(y,2)

a =

    0.5377   -0.1241   -1.0689    1.0933
    0.3188    0.6715    0.3252   -1.2141

i expected the matrix to downsample in the rows and columns what am i doing wrong?

Answer 1

The documentation says it will only downsample along rows, but you can extend it to 2D by doing,

tmp=downsample(y,2);
a=downsample(tmp.',2).';