matlab code takes really long time large matrix

Hi ;

I want to solve forced vibration problem with ODE45. But mass, stiffness, damping matrix are 14*14 and force matrix depends on time and multiple lines have time-dependent forces value.it's been over an hour and still I couldnt see time-displacement graph :( What should I do?

[James Tursa]

Is your problem stiff? Maybe you need to use a stiff solver.

[Gloria]

Thank you so much :) Yes ODE15s or ODE23s is working :)