# b4step default routines¶

For GeoClaw, see b4step routine in GeoClaw.

Below are the default b4step library routines for Classic and AMRClaw. By default these do nothing. If you wish to specify aux arrays you will need to copy one of these files to your application directory and modify it as needed. Remember to change to Makefile to point to the proper version.

$CLAW/classic/src/1d/b4step1.f90: System Message: WARNING/2 (/var/folders/_s/dx0xgftn3_x04rdx0_w5nq7w0000gn/T/tmpmsmlca8x/24e2c68df118c5a00b116198860c806cae4b064d/b4step_defaults.rst, line 18) Include file ‘/var/folders/_s/dx0xgftn3_x04rdx0_w5nq7w0000gn/T/classic/src/1d/b4step1.f90’ not found or reading it failed$CLAW/classic/src/2d/b4step2.f90:

System Message: WARNING/2 (/var/folders/_s/dx0xgftn3_x04rdx0_w5nq7w0000gn/T/tmpmsmlca8x/24e2c68df118c5a00b116198860c806cae4b064d/b4step_defaults.rst, line 24)