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function [nArgOut,vectInput]=_check2dFun(funName,func,X)
// In this function we determine wether the function 'func'
// has the syntax [y]=func(x) or [x,y]=func(t).
// We also test if the function accepts vector input
// arguments.
//
// This allow to understand in a 2d plot function (plot)
// if the user has requested a 2d plot of a parametric or
// non-parametric curve.
// First We get the two strings in and out containing the
// names of input and output arguments :
[out,in,text]=string(func);
nArgOut=max(size(out));
nArgIn=max(size(in))
if nArgIn~=1
_error(sprintf('%s : function must accept two input arguments',funName));
end
if nArgOut~=1 & nArgOut~=2
_error(sprintf('%s : function must have 1 or 2 output arguments',funName));
end
// Now we test if func accepts vector inputs (we test with the X,Y
// pair provided by the user)
if nArgOut==1;
ierr=execstr('yf=func(X)','errcatch');
if ierr==0
vectInput=(and(size(yf)==size(X)));
else
vectInput=%F;
end
elseif nArgOut==2
// now we test if func accepts vector inputs (as above)
xf=[];yf=[];
ierr=execstr('[xf,yf]=func(X)','errcatch');
vectInput=(ierr==0 & and([size(xf)==size(yf) ...
size(yf)==size(X)]));
end
endfunction
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