Hi Hongxiao,
Yes, the E1 argument represents the independent variable, and it can also be an expression. Generally, in dynamic analysis, time is an independent variable. However, you can also use expression; it completely depends on your requirements and what information you need. I have tested the below function, which is working fine.Please test the below function expression.
STEP(WZ(#1,#2),-1*126/180*PI,1,126/180*PI,-1)*(0.535*AKISPL(ABS(FZ(#1,#2)),0,#3,0))+AKISPL(SQRT(TX(#1,#2)*TX(#1,#2)+TY(#1,#2)*TY(#1,#2)),0,#4,0)+8.78
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