# how to solve 'Error using | Matrix dimensions must agree. ' ?

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neda eskandari on 18 Jun 2019
Commented: neda eskandari on 18 Jun 2019
Hello Dears
i have the error that i mentioned in question and i do not know how i can solve it.
while (Lia2_One_Three ~= zeros(length(Lia2_One_Three),1) | Lia2_Two_Three ~= zeros(length(Lia2_Two_Three),1))
row_n2_three_step = randperm(length(area_2) / 2, n2_three_step_delayed_measurements) ;
Lia2_One_Three = ismember(row_n2_one_step, row_n2_three_step) ;
Lia2_Two_Three = ismember(row_n2_two_step, row_n2_three_step) ;
end
it seems that this error says that 'Lia2_One_Three ~= zeros(length(Lia2_One_Three)) ' and
' Lia2_Two_Three ~= zeros(length(Lia2_Two_Three))' should have same dimention. i just want to say that while the first condition or second condition is true, produce ' row_n2_three_step' again.
'Lia2_One_Three ' and ' Lia2_Two_Three ' are vectors with different dimentions.

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neda eskandari on 18 Jun 2019
sure
neda eskandari on 18 Jun 2019
please see 108 to 112 rows
neda eskandari on 18 Jun 2019
Thank you Dear

James Tursa on 18 Jun 2019
Edited: James Tursa on 18 Jun 2019
Maybe this line:
while (Lia2_One_Three ~= zeros(length(Lia2_One_Three),1) | Lia2_Two_Three ~= zeros(length(Lia2_Two_Three),1))
while ( any(Lia2_One_Three(:)) || any(Lia2_Two_Three(:)) )
I'm guessing a bit on what I think you want the test to do.
Note that the ~= and | operators are element-wise operators, which I am guessing is not what you really want to use here.

neda eskandari on 18 Jun 2019
should not we write :
while ( any(Lia2_One_Three(:) ~= 0) || any(Lia2_Two_Three(:) ~= 0) )
James Tursa on 18 Jun 2019
The any( ) functions tests for nonzeros, so the ~=0 part in your proposed code is redundant.
neda eskandari on 18 Jun 2019
thanks a lot