Tham khảo tài liệu 'art of surface interpolation-chapter 4: graphical user interface', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | In the rows containing the text in red prompts SURGEF offers default or suggested values and expects a response from the user. The user can leave the suggested value by pressing the Enter key or can enter a new value examples can be seen in blue . If Y yes is answered to the prompt READ FILE .GRD Y N N the existing grid file is read as the initial interpolation approximation function. It means that the vector DZ is not initialised as vector Z in the first step of the interpolating algorithm see Interpolation algorithm but its values are computed as DZt Zi - f Xt Yi . Moreover the read grid can be smoothed first because in this case the following additional prompt is displayed SMOOTHING OF READ GRID 0 The default value 0 means that no smoothing will be performed. The following two prompts GRID SIZE IN X-DIRECTION MIN. 500 500 600 and GRID SIZE IN Y-DIRECTION MIN. 348 417 are intended for changing the default grid size suggested by SURGEF. The grid size in the y-direction is suggested so that the difference between Dx and Dy is minimal see Specification of the grid . If any of the grid sizes are smaller than the minimal value there is a high probability that the iteration process will not converge. The GRID SIZE ENLARGEMENT 62 asks for the number of grid rows and columns which are used for enlarging the interpolation function domain see Smoothing and tensioning on grid boundary . The value suggested by SURGEF should be left unchanged - changing this value is intended only for development purposes. The last prompt SMOOTHING 99 100 enables to change the number of smoothing cycles. The suggested value is sufficient for obtaining a smooth surface but for example if a trend surface has to be obtained the value may be higher even several times . To run SURGEF without waiting for prompt entries . automatically using suggested values the second command line parameter A can be used E Fprog Surgefr data SURGEF N A 42 Chapter 4 Graphical user interface The .
