MATLAB Object-Oriented Programming

class(c)

ans =

double

The Character Converter

The char method produces a char vector that represents the polynomial displayed as

powers of x. The char vector returned is a syntactically correct MATLAB expression.

The char method uses a cell array to collect the char vector components that make up

the displayed polynomial.

The disp method uses the char method to format the DocPolynom object for display.

The evalPoly method uses char to create the MATLAB expression to evaluate.

Users of DocPolynom objects are not likely to call the char or disp methods directly, but

these methods enable the DocPolynom class to behave like other data classes in

MATLAB.

Here is the char method.

methods

function str = char(obj)

if all(obj.coef == 0)

s = '0';

str = s;

return

else

d = length(obj.coef)-1;

s = cell(1,d);

ind = 1;

for a = obj.coef;

if a ~= 0;

if ind ~= 1

if a > 0

s(ind) = {' + '};

ind = ind + 1;

else

s(ind) = {' - '};

a = -a;

ind = ind + 1;

end

end

if a ~= 1 || d == 0

if a == -1

s(ind) = {'-'};

ind = ind + 1;

else

s(ind) = {num2str(a)};

ind = ind + 1;

19 Defining Custom Data Types