CAD／CAM技术及应用(7)

CAD／CAM技术及应用

method = 'linear';

else

method = varargin{3};

end

else

if nargin >= 3+xOffset && ~isempty(varargin{3+xOffset})

method = varargin{3+xOffset};

else

method = 'linear';

end

end

% The v5 option, '*method', asserts that x is equally spaced.

eqsp = (method(1) == '*');

if eqsp

method(1) = [];

end

% INTERP1([X,]Y,XI,METHOD,'extrap') and INTERP1([X,]Y,Xi,METHOD,EXTRAPVAL) if ~ppOutput

if nargin >= 4+xOffset

extrapval = varargin{4+xOffset};

else

switch method(1)

case {'s','p','c'}

extrapval = 'extrap';

otherwise

extrapval = NaN;

end

end

end

% Start the algorithm

% We now have column vector xCol, column vector or 2D matrix yMat and

% column vector xiCol.

if xOffset

if ~eqsp

h = diff(xCol);

eqsp = (norm(diff(h),Inf) <= eps(norm(xCol,Inf)));

if any(~isfinite(xCol))

eqsp = 0; % if an INF in x, x is not equally spaced

end

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