Hi!

I am doing a simulation about proton-induced acoustic emission.I don't know how to set the initial pressure distribution in 2D grid.I am confused about the Example:Photoacoustic Waveforms In 2D.It shows:

% create initial pressure distribution

source.p0 = makeDisc(Nx, Nx, Nx/2, Nx/2, source_radius);

But in makeDisc, it shows Discdisc = makeDisc(Nx, Ny, cx, cy, radius, plot_disc),i don't know what Nx/2 means.

And i am also confused about Loading the image map,can i import initial pressure data by this way?I am new in k-wave.

Any help will be appreciated!