How to add negative number to the and of rand function

Hello I have to generate 5 lines of random numbers and at the end of random numbers I have to add one extra negative number from (-1 to -9) I tried strcat and things like that but I couldn't combine negative and real numbers can You help me please? The code below will create everything what I need but I have to somehow combine them. Result has to be for example. Then I have to send them via serial port to the arduino. I know how to do it but sometimes it showed me error. It works only when i send it as a string. I had it like this i = input('Pu numbers: ', '%s'), fwrite(s,i); and it works but now I have to send those random numbers

if true
  1 2 3 4 5 -1
5 8 3 5 9 -2
.
.
.
9 2 4 8 6 -9
end

if true
  % for b = 1:9    
  x = round(rand(1,5)*9);
  disp(x)
end
for a = -1:-1:-9

    disp (a);
end

end

Answer 1

[Roger Stafford]

What about

   x = [floor(10*rand(1,5)),floor(-9*rand)];

(Note: writing "round(rand(1,5)*9)" makes 0 and 9 half as probable as each of the other integers in between.)

[George Francis]

I have to do it separatly and then add the negative numbers. Also the negative numbers can't be random. It has to be in order from -1 to -9.

1 2 3 4 5 -1 
4 7 8 9 3 -2
.          -3
.          -4
1 4 7 8 9  -5
etc.

Answer 2

[Renato Agurto]

Assuming x is your 9x5 random matrix:

 out = [x (-1:-1:-9)'];

is this what you want?

[George Francis]

It shows me error Dimensions of matrices being concatenated are not consistent.

Also then I have to write each line to the serial port separetly, that's why I have there loop for

[Renato Agurto]

yes, but you have 2 separate for loops. Can you give us an example of x... should it be constantly overwritten or is a big matrix?

[George Francis]

I don't know how it supposed to look. I thought that I will make in the firts for loop random numbers from 1 to 9 then in another for loop I'll try add negative numbers in order from -1 to -9 and then I will create another for loop with pause which sends this data into serial port one by another.

1 step
1 2 3 4 5  
4 7 8 9 3 
.          
.          
1 4 7 8 9  

2 step
1 2 3 4 5 -1 
4 7 8 9 3 -2
.          -3
.          -4
1 4 7 8 9  -5

3 step
for p = 1:9
fwrite(serial object, data x);
pause(5);
end