Try re-downloading CVX 2.2, and installing it. i
If that doesn’t resolve matters,
There should be a vec.m under sedumi in the CVX installation. Do you have a sedumi directory under D:\Program Files\MATLAB\R2016b\cvx-w64 ?
Try copying that file to a directory somewhere before CVX in yout MATLAB path.
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Perhaps the forum software won’t let you post another reply at Cannot perform the operation: {concave} ./ {real affine} because you’re a new poster? It let me (I then deleted the test post).