how to convert digital data into analog data using matlab code?

how to convert digital data into analog data using matlab code? and vice versa… i.e., converting back analog data into digital data?

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U=10; % range signal from 0 to 10
n=3 % number of bits
q=U/(2^n-1)  % quantization interval
t=0:0.1:10; % your time vector
y=abs(10*sin(t)); % your signal
% -------convert to a digital signal yd-----------
a=fix(y/q);
yd=dec2bin(a,n)
% ------you can calculate the signal yq ----------
yq=a*q 
%-------------------------------------------------
plot(t,y,'r')
hold on
plot(t,yq,'g')
hold off

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how to convert digital data into analog data using matlab code?

how to convert digital data into analog data using matlab code?