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I think you're on the right track, or at least the same as my interpretation. It appears the request is for something like:

Matx33f a = Matx33f::ones();
Vec3f b = Vec3f::ones(); <--- currently does not work, needs to be implemented

error: conversion from ‘cv::Matx<float, 3, 1>’ to non-scalar type ‘cv::Vec3f {aka cv::Vec<float, 3>}’ requested
     Vec3f b = Vec3f::ones();

I hope you succeed, it looks useful!