for loop group of numbers

Question

I am trying to create a for loop that inserts a group of numbers,

I would like to insert what I have in the '' each time, here, three times.

for zz=['1 0 0 0', '0 1 0 0', '0 0 0 1'];
    H=zz
end

Any ideas would be appreciated.

Answer 1

You are thinking about correcly, however you have made the classical mistake of using '' in stead of "". The first is a character array the latter is a string. In other words,

A = 'hello';

corresponds to the vector of letters

A = ['h','e','l','l','o'];

Thus when you write

zz=['1 0 0 0', '0 1 0 0', '0 0 0 1']  

you concatenate the characters and obtain

zz ='1 0 0 00 1 0 00 0 0 1';

then running the for-loop runs through that vector first setting z='1', then z=' ' (space) and so on. What you want (i guess) is to put

zz=["1 0 0 0", "0 1 0 0", "0 0 0 1"]

which is the vector of the three strings "1 0 0 0", "0 1 0 0" and "0 0 0 1", thus your for-loop puts first zz="1 0 0 0" then z = "0 1 0 0" and finally zz ="0 0 0 1".

In total

for zz=["1 0 0 0", "0 1 0 0", "0 0 0 1"];
    H=zz
end