how can i solve this error?and how can i get wavelet toolbox ?

'dwt2' requires Wavelet Toolbox.

Error in mine (line 16)

[cA,cH,cV,cD] = dwt2(Host,'Haar');

Answer 1

[Sindar]

Check here whether you have a license for it, or need to buy: https://www.mathworks.com/products/wavelet.html?s_tid=srchtitle#try-buy

Then, use these instructions to add it to your Matlab installation"

https://www.mathworks.com/matlabcentral/answers/101885-how-do-i-install-additional-toolboxes-into-an-existing-installation-of-matlab