assign is used to explicitly assigning the value obtained when applying the command double on an sdpvar object.
Note, assign does not replace or constrain the variable with a particular value. It is only used for initial values in nonlinear solvers. Hence, only used when the option usex0 in sdpsettings is activated.
Syntax
assign(X,Y)
Examples
Variables are initialized as NaN
x = sdpvar(1,1);
double(x)
ans =
NaN
double(x)
ans =
NaN
By using assign, the current value can be altered
assign(x,1)
double(x)
ans =
1
double(x)
ans =
1
By default, inconsistent assignments generate an error message.
t = sdpvar(1,1);x = [t t];
assign(x,[1 2])
??? Error using ==> sdpvar/assign
Inconsistent assignment
assign(x,[1 2])
??? Error using ==> sdpvar/assign
Inconsistent assignment
With a third argument, a least squares assignment is obtained
t = sdpvar(1,1);x = [t t];
assign(x,[1 2],1)
double(x)
ans =
1.5000 1.5000
assign(x,[1 2],1)
double(x)
ans =
1.5000 1.5000