Fix omega -> \omega in manual's timescale discussion.

[sawsim.git] / src / sawsim.nw

diff --git a/src/sawsim.nw b/src/sawsim.nw
index 96165a6ececc809de3353635e76f18c9c32d51b6..5f89121e6f23443520fdf9bdeabd19a3c47f85c2 100644 (file)
--- a/src/sawsim.nw
+++ b/src/sawsim.nw
@@ -685,7 +685,7 @@ along the chain.  The quality of this assumption depends on your
 particular chain.  For example, a damped spring thermalizes on a
 timescale of order $\tau = 1/\gamma$ where the damping ratio $\gamma
 \equiv \omega_0(-\zeta \pm \sqrt{\zeta^2-1}$, the natural angular
-frequency $omega_0 \equiv \sqrt{k/m}$, $\zeta \equiv b/2\sqrt{km}$,
+frequency $\omega_0 \equiv \sqrt{k/m}$, $\zeta \equiv b/2\sqrt{km}$,
 and $b$ sets the drag $F_b = -bv$.  For our cantilevers $\tau$ is
 on the order of milliseconds, which is longer than a timestep.
 However, the approximation is still reasonable, because there is
@@ -6654,7 +6654,7 @@ clean : $(CHECK_BINS:%=clean_%) $(SAWSIM_MODS:%=clean_%) \
                $(BUILD_DIR)/interp.c $(BUILD_DIR)/interp.h \
                $(BUILD_DIR)/tavl.c $(BUILD_DIR)/tavl.h \
                $(BUILD_DIR)/global.h ./gmon.out
-       $(SHELL) -e -c "rmdir $(BUILD_DIR) $(DOC_DIR)"
+       $(SHELL) -e -c "rm -rf $(BUILD_DIR) $(DOC_DIR)"
 
 # Various builds of sawsim
 $(BIN_DIR)/sawsim : $(SAWSIM_SRC) | $(BIN_DIR)