why can´t i use some functions such as a "hanning" or a "blackman" window even some others like "imnoise" or" RGB2gray"? (i have the r2014a version)

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function vent(n)
xrw=rectwin(n);
xhn=hanning(n);
xhm=hamming(n);
xbk=blackman(n);
figure
subplot(2,2,1)
stem(xrw,'y')
subplot(2,2,2)
stem(xhn,'k')
subplot(2,2,3)
stem(xhm)
subplot(2,2,4)
stem(xbk,'r')

Answers (1)

Geoff Hayes
Geoff Hayes on 17 Nov 2014
Rodrigo - for functions like hanning and blackman, you need the Signal Processing Toolbox. For a function like imnoise and rgb2gray (R2014a) you need the Image Processing Toolbox.
To see if these toolboxes are installed with your version of MATLAB, in the Command Window type
ver
Do you see these toolboxes?
(Note that rgb2gray now seems to be a part of base MATLAB as of R2014b.)

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