Small problem in a if condition

[Pol]

Hi there,

I'm trying to convert that script from matlab to octave and I'm hurting
my head on that script:

function zp = kzp(v,z,i)

if (v == '?')
    d = z*i   ;
endif

if (z == '?')
    d = v/i   ;
endif

if (i == '?')
    d = v/z   ;
endif

M = norm(d) ;
P = angle(d)*180/pi ;
zp=[M;P];

endfunction

And now the errors:

octave:1> kzp(1,'?',3)
error: invalid conversion from string to real matrix
error: type conversion failed for binary operator `=='
error: evaluating binary operator `==' near line 7, column 7
error: if: error evaluating conditional expression
error: evaluating if command near line 7, column 1
error: called from `kzp' in file `/home/pol/.octave/m/kzp.m'
octave:1> 


Thx for the help, have a happy sunday all.

 -pol-

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