[Octave-bug-tracker] [bug #65060] classdef: extremely slow writing to array properties

[A.R. Burgers]

Follow-up Comment #1, bug#65060 (group octave):

I made a mistake in my original example, revised and simplified file foo2.m
u_foo2.m attached. The assigns to the numerical array are extremely slow,
despite the array being pre-allocated.

output of u_foo2.m


Time for assign to array: 0.000345945
Time for assign to property: 5.56618


u_foo2.m:


__vm_enable__(0);
nrep =  30;
dims = [2000, 2, 20300];

data_d = zeros(dims);

f_classdef = foo2;
f_classdef.data_d = zeros(dims);

dat_set = rand(dims(1), dims(2));

tic;
for i = 1 : min(nrep, dims(3))
  data_d(:, :, i) = dat_set;
end
fprintf('Time for assign to array: %g\n', toc);

tic;
for i = 1 : min(nrep, dims(3))
  f_classdef.data_d(:, :, i) = dat_set;
end
fprintf('Time for assign to property: %g\n', toc);




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