Does MATLAB copy large input parameters or does it operate on pointers?

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Christof Buss
Christof Buss 2017-7-27
编辑： Adam 2017-7-27
X is a large Array of matrices which is passed to a function f(X). Does MATLAB copy this Matrix or does the function f(X) read the original Matrix by means of pointers?

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Adam
Adam 2017-7-27
编辑：Adam 2017-7-27
Matlab takes a copy of a matrix only when you make a change to that matrix, so even though it does not use pass by reference (except for handle-derived classes) it will not take a copy of an array if you pass it to another function and use it for read-only purposes. The copy will happen when you make a change to the array in your function. i.e. essentially it uses copy-on-write semantics.

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