Abstract: In this paper, the date processing method is presented for evaluating angularity error for a flat to a datum flat in arbitrary position of three-dimensional space based on optimization toolbox and genetic algorithms toolbox of MATLAB. A computer data processing program of optimization of angularity errors for plat to datum flat is developed based on the reference satisfying with the smallest condition, the least squares method, the three distant prospects, and the diagonal lines. The erroneous value is directly given, and the angularity error is shown with diagrammatic view. The testing results show that the algorithm is reliable.

Key words: flat to datum flat, angularity error, MATLAB, optimization toolbox, genetic algorithms toolbox