Merge pull request #75 from inwoo-park/main

CHG: basalstress.m - Fix bugs.

Author: TidbitSoftware

src/m/mech/basalstress.m

@@ -9,7 +9,7 @@
 %   See also: plot_basaldrag
 
 %Check md.friction class
-if ~isa(md.friction,friction)
+if ~isa(md.friction,'friction')
 	error('Error: md.friction only supports "friction.m" class.');
 end