i try to find that how to using multi-dimension arrays minus a constant in julia1.0 documents, but i fail. so can you help me? thanks

[image] lannisite110: multi-dimension arrays minus a constant Do you need to subtract a scalar from each element? Then use broadcasting , eg some_array .- some_scalar If you need something else, please explain in detail (eg provide an example of the desired input and output).

xtrn[:,:,1,:] = xtrn[:,:,1,:].-rxtrn; where xtrn is a 4 dim arrays and rxtrn is a constant. when i run the file in this line, the peoplem as following occured. ERROR: LoadError: syntax: extra token “rxtrn” after end of expression

there occur a strange thing. when i change xtrn[:,:,1,:] = xtrn[:,:,1,:].-rxtrn to xtrn[:,:,1,:] = xtrn[:,:,1,:].-rxtrn;xtr=xtrn[:,:,1,:].-rxtrn;xtrn[:,:,1,:]=xtr. it work. And the last sentence have no need to change, do you know the reason. I want to know that. [image] Tamas_Papp: [image…

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It may need a .= with an indexing operation ( a[] ) on the left, and with all(?) broadcast-like ( .- ) operators on the right, for the broadcast fusion optimization a = ones(3,3,3,3); a[:,:,1,:] .= a[:,:,1,:] .- 1; b = ones(3,2); c = ones(2, 1); b[:, 1] = b[:,1] * c[1,1] ##matrix multiply

A usage about multi-dimension arrays

General Usage

Tamas_Papp October 20, 2018, 8:39am 5

Please post an MWE.

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A usage about multi-dimension arrays

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