Dear user

I want to calculate Mises stress of each atom. I know the formula and read the manual ,but I still don’t know what went wrong

each time I run the script, the monitor shows “Invalid attribute in dump custom command”

Related commands are as follows：

compute 3 all stress/atom NULL

variable b atom sqrt(0.5*((c_3[1]-c_3[2])^2+(c_3[2]-c_3[3])^2+(c_3[3]-c_3[1])^2+6*(c_3[4])^2+6*(c_3[5])^2+6*(c_3[6])^2))

dump 3 all custom 20 dump.txt id type x y z b

Best wishes