matlab - Animated Discrete Stem Plot -

so want create animated plot of discrete-time complex exponential function. simplest non-animated plot given this:

n=-5:40; x=(exp((3*4j)*n)).*(n>=0); y=real(x); subplot(2,1,1); stem (n,y) z=imag(x); subplot(2,1,2); stem (n,z) 

how animate show function different numbers of samples considered in given interval (assuming have time interval specified start second , end second , vector containing number of sample values in given interval)?

i tried along these lines:

figure,hold on xlim([min(x(:)) max(x(:))]) ylim([min(y(:)) max(y(:))])  %// plot point point k = 1:numel(x)     stem (k,y) %// choose own marker here     pause(0.001);      end 

that doesn't compile. how achieve this?

short answer:

make following 2 changes:

① replace xlim([min(x(:)) max(x(:))]) xlim([1 numel(x)]).
② replace stem (k,y) this: stem (k,y(k)).

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detailed answer:

① xlim([min(x(:)) max(x(:))]) giving following error:

error using matlab.graphics.axis.axes/set while setting 'xlim' property of 'axes': not valid limitswithinfs value. complex inputs not supported 

the error message tells problem is. vector x contains complex numbers. time axis having complex numbers doesn't imply anything.
it seems want replace line xlim([min(x(:)) max(x(:))]) this:
xlim([1 numel(x)]).

② inside loop, stem (k,y) giving error:

error using stem (line 46) x must same length y. 

the error message tells problem is. here k scalar (1x1) y 1x46 vector.
since want plot y point point, replace stem (k,y) this: stem (k,y(k)).

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output after making mentioned fixes: