looping with certain condition

Hi, Supposed I have two matrices A and B. A = size 443823 x 1 and B = size 870 x1

Sample data of Matrix A = A =[1 1 1 (n of times)… 2 2 2(m of times) 3 3 3 (p of times) Until the end.

And sample data in Matrix B = B = [180 182 185 189 150 ..... Till the end].

From above matrix, I would like to assign value from B depends on A in new Matrix C, result as follow- c =[180 180 180 (n times) 182 182 (m times) 185 185 (p times) 189 189 189 189 (... times]

can any one help this.

tq. aqef

Answer 1

[Jan]

C = B(A)

[aqef alif]

tq.

[aqef alif]

hi,what about if Sample data of Matrix A = A =[1 1 1 (n of times)… 3 3 3 3(m of times) 5 5 5 5 (p of times) Until the end.(its in odd number)

And sample data in Matrix B = B = [180 182 185 189 150 ..... Till the end].

From above matrix, I would like to assign value from B depends on A in new Matrix C, result as follow- c =[180 180 180 (n times) 182 182 (m times) 185 185 (p times) 189 189 189 189 (... times].

because when i tried the C = B(A), its give me error 'Index exceeds matrix dimensions'.

Sorry because i'm still new with matlab.

thank you very much

[Jan]

@aqef alif: The error message means, that you A contains elements, which are larger than the number of elements of B. Most likely this is caused by a bug in the code before. Check this by:

max(A)
size(B)

[aqef alif]

the max(A) is 10809 and size (B) is 5405. I run the same code as from the earlier question. It was working. What could be the solution?

[aqef alif]

[~,~,Ai] = unique(A);

C=B(Ai);

i tried the above and its work. thank you

[Jan]

I cannot know this. You have to find out what you want to get if the index is larger than teh array: An error message, NaN values, no values by cropping the index vector. I cannot decide this, because I do not know the purpose of the code.