Table of Contents

"freeze, unfreeze" commands

Purpose

“Freeze” to a point in time. Remember circuit voltages and currents.

Syntax

freeze
unfreeze

Comments

After the freeze command, the transient and fourier analysis will continue from the values that were kept by the freeze command, instead of progressing every time.

This allows reruns from the same starting point, which may be at any time, not necessarily 0.

Examples

transient 0 1 .01

A transient analysis starting at zero, running until 1 second, with step size .01 seconds. After this run, the clock is at 1 second.

freeze

Remember the time, voltages, currents, etc.

transient

Another transient analysis. It continues from 1 second, to 2 seconds. (It spans 1 second, as before.) This command was not affected by the freeze command.

transient

This will do exactly the same as the last one. From 1 second to 2 seconds. If it were not for freeze, it would have started from 2 seconds.

transient 1.5 .001

Try again with smaller steps. Again, it starts at 1 second.

unfreeze

Release the effect of freeze.

transient

Exactly the same as the last time, as if we didn't unfreeze. (1 to 1.5 seconds.)

transient

This one continues from where the last one left off: at 1.5 seconds. From now on, time will move forward.