excel udf - Circular Error in VBA User defined Function -


i new vba programming , have written vba function interpolation. attempt input cell c17 , other cell in column cto function "windpressure"

the function gets input column c( height above ground z (m) ) , interpolate design wind pressure, fail due circular error.

the code follow:

function windpressure(z double) double        dim row_nos integer        dim x1 double       dim x2 double       dim x3 double        dim y1 double       dim y2 double       dim y3 double        ' select first line of data.       range("t13").select        ' set nos of row interploate       row_nos = 12        ' interpolation design wind pressure       = 0 row_nos           ' case 1: <= 5m          if = 0 , z <= activecell.value              windpressure = activecell.offset(0, 1).value              ' shifting             activecell.offset(0, -1).select              'exit if enter if statement             exit function           elseif >= 0 , z <= activecell.value            ' case 2: > 5m             x1 = z              x2 = activecell.offset(-1, 0).value              x3 = activecell.offset(2, 0).value              y2 = activecell.offset(-2, 1).value              y3 = activecell.offset(2, 0).value              y1 = ((x1 - x3) / (x2 - x3) * (y2 - y3)) + y3             windpressure = y1              ' shifting             activecell.offset(-1, -1).select              'exit if enter if statement             exit function           end if             activecell.offset(1, 0).select       next   end function
  1. could tell me step in script wrong
  2. is there anyway convenient test function? not procedure execute directly clicking f5 button

many attention , help.

this how debug f5 or f8 procedure:

public sub testme()      debug.print windpressure(7)  end sub  function windpressure(z double) double      stop     'the rest of function '    dim row_nos integer '    dim x1 double '    dim x2 double '    dim x3 double  end function

now run testme pressing f8 , enjoy debugging.

another way write ?windpressure(7) in immediate window , put stop sign in vb editor. go line line.

concerning errors, remove select part function, vba not allow use there.


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