Why will window show me “Improper assignment with rectangular empty matrix” sometimes?
It seems this error should tell me ,there is an error or bug in your code,so i can’t run this code correctly,i will stop at the some or one of that error lines,if my thinking is correct,why will the code can give me the result sometimes? i mean,it can run the code correcly sometimes,but sometimes,it will stop running because of that error.
Why?i have no ideal why is this happend,here is my code below,and i use cvx ,you have to install the cvx first or you can’t run the code below,and because using the cvx in the matlab,i can just declare variable
cvx begin ,FNNK_lowr(N,N,K) semidefinite , cvx end ,subject to ,etc instructions
hat_p_lowr=0.0315
bd=300
bdc=101
AXX3=zeros(1,bd);
lkk=1:bdc%lkk=1, 2, 3, 4
lkkspace=zeros(1,bdc)
rho_k=0:0.01:1
for lkk=1:bdc
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
for dd=1:bd
%OP4
%declare
K=4;
N=4;
L=5;%distance between RX & TX
xi=10^-4%tolerence between
nois_var_hk_2pow=0.1*(L^(-2.5))*10;%W,0.1*(L^(-2.5)),if this unit is dbm
nois_var_ak_2pow=[1.0000e-10 1.0000e-10 1.0000e-10 1.0000e-10 ];
nois_var_dk_2pow=[1.0000e-08 1.0000e-08 1.0000e-08 1.0000e-08 ];
bar_r=[10 10 10 10];
P_T=10
%channel build
h_1=normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])+1i*normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])
h_2=normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])+1i*normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])
h_3=normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])+1i*normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])
h_4=normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])+1i*normrnd( 0,sqrt(0.1*(L^(-2.5))) ,[4,1])
h_kk=cat(2,h_1 ,h_2 ,h_3, h_4)
for n=1:4
h_k{n}=h_kk(1:4 , n);
n=n+1;
end
%==========================
cvx_begin
variable FNNK_lowr(N,N,K) semidefinite;%c7
%==========================
Fkk_lowr=cat(2,FNNK_lowr);
lowr=0
for o_lowr=1:4
Fk_lowr{o_lowr}=Fkk_lowr(1:4,o_lowr+3*lowr:4*o_lowr)
lowr=lowr+1;
end
tr_ace_lowr=0
for t=1:K
tr_ace_lowr=tr_ace_lowr+trace(Fk_lowr{t})
end
%====================================
%object function
minimize( tr_ace_lowr )
%====================================
%Constraint
subject to
%===================================================
%c5
c5_left_hand_lowr = 0;
for k = 1:K
sum_5_lowr = 0;
for j = 1:K
if j ~= k
sum_5_lowr = sum_5_lowr + h_k{k}' * Fk_lowr{j} * h_k{k};
end
end
c5_left_hand_lowr = c5_left_hand_lowr - sum_5_lowr+ (h_k{k}' * Fk_lowr{k} * h_k{k}*inv_pos(bar_r(1)))
c5_right_hand_lowr= nois_var_ak_2pow(1)*rho_k(lkk)+ nois_var_dk_2pow(1)
real( c5_left_hand_lowr ) *rho_k(lkk) >= c5_right_hand_lowr
end
%===================================================
%c10
c10_left_hand_lowr = 0;
sum_10_lowr = 0;
for j = 1:K
sum_10_lowr= sum_10_lowr + h_k{k}' * Fk_lowr{j} * h_k{k};
end
c10_left_hand_lowr =real(c10_left_hand_lowr + sum_10_lowr+nois_var_ak_2pow(1))*(1-rho_k(lkk))
c10_right_hand_lowr=hat_p_lowr
c10_left_hand_lowr>= c10_right_hand_lowr
cvx_end
c3(dd)=AXX3(dd)+cvx_optval;
end
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
allthings=c3
c3_noninf=allthings(~isinf(allthings))
meann=min(c3_noninf)
[minvalue, n] = min(c3_noninf)
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
us(lkk)=lkkspace(lkk)+minvalue
end
allthings_compare=us
min_samepower_diff_rho_F=min(us)
P_Tp=min_samepower_diff_rho_F
And the error always happen in this line
us(lkk)=lkkspace(lkk)+minvalue
If this error are shown in the window,all elements in FNNK_lowr are NaN,and i am confused in here too,the FNNK_lowr are the variable i declare,why are the elements be “NaN” ?