| Library: | spatial |
| See also: | SPKRsurfls SPKRsurfgls SPKRexpcov SPKRgaucov SPKRsphercov SPKRtrmat SPKRprmat SPKRsemat SPKRcorrelogram SPKRvariogram |
| Quantlet: | SPKRmultcontours | |
| Description: | Draws multiple contour lines of a spatial object of type "trmat", "prmat", or "semat". |
| Usage: | cont = SPKRmultcontours (disp, pos1, pos2, obj, start, end, step) | |
| Input: | ||
| disp | display - name of the display | |
| pos1 | scalar - row of the display | |
| pos2 | scalar - column of the display | |
| obj | list - (of type "trmat", "prmat", or "semat") calculated by SPKRtrmat, SPKRprmat, or SPKRsemat | |
| start | scalar - starting value for contour lines | |
| end | scalar - ending value for contour lines | |
| step | scalar - step width between two contour lines | |
| Output: | ||
| res | n x 2 - matrix of all points at all levels of the contour lines | |
; load the spatial statistics library
library ("spatial")
; read a spatial data set
topo = read("topo.dat")
; calculate a polynomial regression surface of order 2
myres = SPKRsurfls (2, topo)
; calculate a 30 x 30 grid within [0, 6.5] x [0, 6.5]
; using trend surface myres
mygrid = SPKRtrmat (myres, 0, 6.5, 0, 6.5, 30)
; create a display and draw contour lines in the range
; 750 through 975, using steps of width 25
disp = createdisplay (1, 1)
cont = SPKRmultcontours(disp, 1, 1, mygrid, 750, 975, 25)
A plot of multiple countour lines is drawn and the corresponding points are being returned.
| Library: | spatial |
| See also: | SPKRsurfls SPKRsurfgls SPKRexpcov SPKRgaucov SPKRsphercov SPKRtrmat SPKRprmat SPKRsemat SPKRcorrelogram SPKRvariogram |