concatenate matrix with zeros function

if I have matrix a = [2 3 4; 5 6 7; 8 9 1],

zeros = (a, 2)

is this a valid code? because one of my working code has this. if so how does the output look like ?

[Matt J]

if so how does the output look like ?

Can't you tell by running it?

[Ashis Pandey]

When I run it shows error, Seems like it doesn’t work, but same thing is happening in my working code and it works

[Ashis Pandey]

so why this code doesnt work ?

[Ashis Pandey]

I am trying to understand why this is supposed to work.. you see second line doesnt make sense (ant_pairs contains a matrix), I also dont know how adding .length makes any difference

ants_pairs = vtrigU.vtrigU.GetAntennaPairs(mySettings.txMode);
TxRxPairs = zeros(ants_pairs.Length,2);
for ii = 1: ants_pairs.Length
    TxRxPairs(ii,1) = double(ants_pairs(ii).tx);
    TxRxPairs(ii,2) = double(ants_pairs(ii).rx);
end

[KSSV]

What you want to do? What exactly is your question?

[Ashis Pandey]

In short, if I have matrix a = [2 3 4; 5 6 7; 8 9 1],

zeros = (a, 2)

Why this above code don’t work but the below one(see the third line with zeros function in it) works although both are similar?

%Get antenna pairs and convert to matlab matrix

ants_pairs = vtrigU.vtrigU.GetAntennaPairs(mySettings.txMode);

TxRxPairs = zeros(ants_pairs.Length,2);

for ii = 1: ants_pairs.Length

TxRxPairs(ii,1) = double(ants_pairs(ii).tx);

TxRxPairs(ii,2) = double(ants_pairs(ii).rx);

end

[per isakson]

Let me guess. The value of ants_pairs.Length is a scalar. The word, Length, supports that. The value of a is a 2D array. See zeros.

zeros([2,3],4)

Error using zeros
Size inputs must be scalar.

Answer 1

[Chunru]

The code "TxRxPairs = zeros(ants_pairs.Length,2)" is correct. It has the function name "zeros" followed by the arguments inside the brackets. The first argument "ants_pairs.Length" is a scalar rather a vector or matrix.

> In short, if I have matrix a = [2 3 4; 5 6 7; 8 9 1],

> zeros = (a, 2)

The statement of "zeros = (a, 2)" is wrong. First, the correct stament should be function name (zeros) followed by arguments inside brackets, say

% x = zeros(a, 2)  % wrong

Even the above is still not correct, as a is not a scalar. So the correct statement should be

a = [2 3 4; 5 6 7; 8 9 1];
x = zeros(size(a))            % where size(a0 = [3 3]

x = 3×3

0 0 0 0 0 0 0 0 0

The above is correct in syntax. But we don't know if it is what you want.

You can also have:

y = zeros(a(1,1), 2)   % where a(1,1) is a scalar

y = 2×2

0 0 0 0