1978	 The Use of Interactive Graphics To Solve Numerical Problems	 With the advent of on-line time-sharing computer systems and graphic terminals we have available a new dimension in numerical problem solving capabilities. Rather than simply use the new power to achieve fast turnaround we can develop interactive routines which are easy to use and also take advantage of the insight and visual capabilities of the human problem solver. Several on-line systems for general purpose mathematical problem solving have already been implemented as well as some special purpose systems for solving problems in a particular area such as ordinary differential equations. The advantage of restricting the problem area is that the interface with a user can be greatly simplified. In this paper we discuss some of the advantages accrued by such systems and design considerations for interactive routines. Furthermore an implementation of an on-line least squares data-fitting program PEG is presented with results obtained from empirical data. In conclusion area for future work in this field are discussed. interactive graphics computer graphics graphics least squares data-fitting interactive computing on-line mathematics
