the error " Assignment has more non-singleton rhs dimensions than non-singleton subscripts" when happen?

Question

long zhang 2018-11-19

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评论： Nur Qamarina 2020-4-17

K=128;
N=4;
QPSk_Set=[1 -1 1j  -1j];
Phase_Set=[1 -1];
MAX_SYMBOLS=1e5;
PAPR_Orignal=zeros(1,MAX_SYMBOLS);
PAPR_SLM=zeros(1,MAX_SYMBOLS);
X=zeros(N,K);
Index=zeros(N,K);
for nSymbol=1:MAXSYMBOLS
  Index(1,:)=randi(1,K,length(QPSK_Set))=1;
  Index(2:N,:)=randi(N-1,K，length(Phase_Set))+1;
end
the error  ' Index(1,:)=randi(1,length(QPSk_Set))+1 '

I need help ! How do i solve it??

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Answer 1

Jan 2018-11-19

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编辑：Jan 2018-11-19

在 MATLAB Online 中打开

There is an orphaned "= 1" in the line:

Index(1,:)=randi(1,K,length(QPSK_Set))=1;
%                                     ^^

MAXSYMBOLS is not defined, but MAX_SYMBOLS is.

In

Index(2:N,:)=randi(N-1,K，length(Phase_Set))+1;
%                       ^^

there is an unknown character. Simoply delete it and retype the comma.

QPSK_Set is not defined also, but only QPSk_Set with an lower-case "k".

After fixing these typos, the line is failing:

Index(1,:)=randi(1,K,length(QPSk_Set))

because the left-hand-side is [1 x 128] and the right-hand-side [128 x 4]. Due to the lack of comments it is not clear, what the code should do, so all I can do is guessing:

Index(1,:)=randi(length(QPSK_Set), 1, K)

Finally you overwrite Index(1,:) in each iteration. This is not useful.

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long zhang 2018-11-21

'Index(1,:)=randi(1,K,length(QPSK_Set))+1'

Thank you very much , this seems to be working for me!

Bravo！

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Answer 2

dpb 2018-11-19

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编辑：dpb 2018-11-19

在 MATLAB Online 中打开

Index(1,:)=randi(1,K,length(QPSK_Set))=1;

appears a typo; above wouldn't run. But, the error as given is because the size of subscripting expression (1,:) is a column vector of K elements but you generated a Kx4 array from |randi(1,K,length(QPSK_Set))|. You can't put a 128x4 array into one column; the error is telling you that.