仿真过程中遇到一个问题，亟待解决。
问题显示是：Error in MATLAB Function block 'fangzhen/rrrki.m'. Evaluation of expression resulted in an invalid output. Only finite double vector or matrix outputs are supported
在命令行中显示：> In f:\MATLAB6p5\work\RRRki.m at line 6
Warning: Matrix is singular to working precision.
(Type "warning off MATLAB:singularMatrix" to suppress this warning
请指点一下是怎么回事啊？
谢谢！