Why Low Memory Make Colorbar Unresponsive in Matlab Figures? -

condition: colorbar not 50% of pictures if loop run without pauses; if put breakpoints , run step-wise, colorbars occur; think stability/memory problem

pseudocode

i=1; while (i < 3);      figure('visible', 'off');     hax=axes();     image('parent',hax);      % heavy computation here; see warning below it.      a=rand(1,20000);      b=rand(1,20000);     c=rand(20000,20000);          imagesc(a,b,c);     colorbar(hax)              %% unsuccessful attempts     %drawnow % not     %pause(1) % not      homedir=char(java.lang.system.getproperty('user.home')); % systems     filename=fullfile(home, sprintf('/desktop/%d', i));     export_fig(filename, '-png', '-q101', '-a1', '-m1', ...         '-cmyk', '-nocrop', '-dpng', hax);      i=i+1;  end 

error message after colorbars gone, indicating memory problem

warning: print2array generating 46.1m pixel image. slow , might cause memory problems. 

• suever. command drawnow after colorbar not help.

system: linux ubuntu 16.04 64 bit
matlab: 2016a
hardware: macbook air 2013-mid

this matlab's internal problem. if run short in memory, computation , graphics become unstable in components, cannot profile , understand because closed system. use real data difficult matrix computations reproduce error. extended memory swap described in thread how allocate more space swap , increase size greater ram? 8 gb 36 gb, , no errors now.