How to express if-else (indicator) constraints in cvx?

[jackfsuia (Jack)]

see

If-else statement

Hi, I have a problem with if-else statement which leads to “Disciplined convex programming error: Constraints may not appear in if/then statements.” Could you please help to fix it? As recommend in community page, I checked big M Modelling as well as MIDCP. I still cannot understand how to solve the problem unfortunately. cvx_begin variable V1x(length(t)) for i=1:length(t) IL(i)=-V1x(i)/Rs; end for i=1:length(t) if Vs1(i)>=Vdd-Vtp Ip(i)=0; elseif V1x(i)>Vdd-Vdsatp(i) Ip(i)=Idsatp(i)(…

by the way, the function f you posted is concave to X, it can be expressd by f=(-abs(x)+x)/2+a; in cvx.