MATLAB: Combining Matrices

Question

Hi, I have an upper traingular matrix andf a lower triangular matrix. Both have the exact same size. I want to combine these matrices along the diagonal to get a single composite matrix. How can I do that. Thanks.

Answer 1

e.g.:

>> Ut = triu(randi(45,6))
Ut =
    32     7     5     4     9    25
     0    38    44    18    12     7
     0     0     1    12     7    39
     0     0     0    37     7    28
     0     0     0     0    40    16
     0     0     0     0     0    24
>> Lt = tril(randi(45,6))
Lt =
    19     0     0     0     0     0
     4     3     0     0     0     0
    11    41    17     0     0     0
     6    43     6     6     0     0
     9    23    36    43    37     0
    11    23    18    44     1    21
>> out1 = Ut + tril(Lt,-1)
out1 =
    32     7     5     4     9    25
     4    38    44    18    12     7
    11    41     1    12     7    39
     6    43     6    37     7    28
     9    23    36    43    40    16
    11    23    18    44     1    24
>> % OR
>> out2 = triu(Ut,1) + Lt
out2 =
    19     7     5     4     9    25
     4     3    44    18    12     7
    11    41    17    12     7    39
     6    43     6     6     7    28
     9    23    36    43    37    16
    11    23    18    44     1    21
>>