error Structure assignment to non-structure object

Dear,

I am a beginner in programming matlab. In looking around, I have come across a function which looks like:

for j=1: FUE_Num_eachFemto 
    for i=1:HeNB_Num/4 %Generates Femtocell 1 to 4
        x=rand(1)*10; %Generates random variables 
        y=rand(1)*10; %Generates random variables
        FAP(i).location_x=x; %Femtocell Access Point location 
    end
end

i have problem "FAP(i).location_x=x;" error Structure assignment to non-structure object

thanks!

[Geoff Hayes]

Marwen - you may need to show more of your code. Even with dummy values for FUE_Num_eachFemto and HeNB_Num, I don't observe any problem with the above code.

[Marwen Tarhouni]

Dear, this is my code with values for FUE_Num and HeNB_Num

clc; 
clear ; 
HeNB_Num=16; 
FUE_Num_eachFemto=1; %Number of UE in each unit 
Throughput5_total1=1; 
Throughput3_total1=1; 
for HeNB_Num=4:4:16 
%Throughput_total=zeros(4);
clear FAP;
FAP = zeros(1,HeNB_Num/4);
tic;
for j=1: FUE_Num_eachFemto 
for i=1:HeNB_Num/4 %Generates Femtocell 1 to 4
x=rand(1)*10; %Generates random variables 
y=rand(1)*10; %Generates random variables
FAP(i).location_x=x; %Femtocell Access Point location 
FAP(i).location_y=y+(i-1)*10;

thanks!

Answer 1

[KSSV]

Error comes in here. FAP(i).location_x=x; FAP is not a structure. It is a non structure and it is already initialized. Check what is FAP. Or try to put different name for instead of FAP. See the below error:

K =rand(10) ;

K(1).location = 10 ;

Structure assignment to non-structure object.

Error in impulse (line 4)
K(1).location = 10 ;

K is a matrix, I tried to associate a filed to it. As K is not a structure, error popped out.

[KSSV]

You have initialized FAP as a matrix.

FAP = zeros(1,HeNB_Num/4);

And making it a structure. Instead of zeros make it a structure.

FAP = struct;

[Marwen Tarhouni]

Dear, When i remove FAP

FAP = zeros(1,HeNB_Num/4);

other problem for syntaxe

 FAP(i).location_x=x; %Femtocell Access Point location 
FAP(i).location_y=y+(i-1)*10;

error ///// the variable 'FAP' appears to change size on every loop iteration (within a script).Consider preallocating for speed

Consider preallocating a variable or array before 
entering the loop by using zeros, ones, cell, or a 
similar function. Preallocating avoids the need for
MATLAB to copy the data from one array to another 
inside the loop. For examples of code that do and do *
not preallocate an array, see “Preallocating Arrays”

how to solve this problem

thanks!!

[KSSV]

It is not throwing any error in my pc. What version you are using?

[Marwen Tarhouni]

matlab R2015a