**CIGAL Reference Manual, Chapter 3 (Functions): zproj**
===== Zproj -- Perform arithmetic z-column by z-column within a solid variable =====
**usage: varb2 = zproj(varb1,op)**

ZPROJ combines all the values within a z-column of VARB1 (i.e., all Z values
that would project onto a single point in the XY plane) into a single value in
VARB2, thus reducing a solid variable to a matrix.  Z-column values are combined
according to the operator, OP, which can be any of:
                  MAX, MIN, SUM, MEAN, or STDEV

Examples:
          mat1 = zproj(sol1,max)      ; convert solid to matrix of z-column maxima
          aray1 = zproj(mat1,mean)    ; find mean of each z-column

**See Also:**\\
[[jvs:cigal:manual:chapter3:column|COLUMN(3)]], 
[[jvs:cigal:manual:chapter3:max|MAX(3)]], 
[[jvs:cigal:manual:chapter3:mean|MEAN(3)]], 
[[jvs:cigal:manual:chapter3:min|MIN(3)]], 
[[jvs:cigal:manual:chapter3:stdev|STDEV(3)]], 
[[jvs:cigal:manual:chapter3:sum|SUM(3)]]

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