Compare 2 string documents

Hi, I want to compare 2 strings and see if there are messages that are the same. i want to compare de first line with all the others from the other document and put it in to another string. The string are AIS1 19000 X 1 and AIS2 13000 X 1.

I've coded a little bit but i have an error of matrix dimensions must agree.

M_conjunt = [];

M_D_AIS1 = [];

M_D_AIS2 = [];

N=size(AIS1,1)

P=size(AIS2,1)

for i=1:1:N

for j=1:1:P

seq1=AIS1(i);

seq2=AIS2(j);

linia1=convertStringsToChars(seq1);

linia2=convertStringsToChars(seq2);

if AIS1 == AIS2

M_conjunt = [M_conjunt,i];

end

end

end

I do not undestand why do I continue getting this problem

[David Hill]

What is your expected output for the given input?

[flashpode]

My output is M_conjunt if it repeats and if it not repeats M_D_AIS1 for messages in AIS1 and M_D_AIS2 for messages in AIS2.

[David Hill]

Show us an example of your output based on your input.

Answer 1

[Sulaymon Eshkabilov]

The err is here:

   if AIS1 == AIS2   % ERR
   % Corrected one:
   if   AIS1(i) == AIS2(i)
  

Note that sizes of AIS1 and AIS2 are to match.