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so,

Mat M(10, 10, CV_32FC1, 0.0f);

will create a single channel float matrix, initialized to 0 ( please use 0.0f here, so it does not get mistaken as a 0 pointer)

and:

Mat M(10, 10, CV_32FC3, 0.0f);

will create a similar 3 channel matrix. (CV_32F is just an alias for CV_32FC1)