Create FOR loop to insert the matrix elements row-wise

I want to create a matrix in an equivalent way as it is possible in C++: just to insert the elements one after the other with a loop like:

cout<<"\nEnter elem. of aug. matrix row-wise:\n";
for (i=1;i<=n;i++) {
      for (j=1;j<=n+1;j++)  {
cin>>a[i][j]; //input the elements of array
    }
}

It is possible to make this in MAtlab ? Something like below, but without to press enter after each element:

% lets say,   A=[1 2 ; 5 7 ] but I want just to write only 1 2 5 7 and press ENTER.
n=input('matrix dimension:')
for i=1:n
for j=1:n
a(i,j)=input('   Insert the elements row wise, one after the other:')     
end
end
a=reshape(a,n,n)

Answer 1

[KSSV]

n=input('number of elements =  ')  % n = 4 
for i=1:n;
   a(i)=input('elements-');      % 1 2 5 7
end
a=reshape(a,n/2,n/2)'   % not should be even for this example

[tbaracu]

You are also close, but your code requires to press enter after each element.

I want just to write the dims of the matrix (n or n x m), then to input from keyboard the series 1 2 5 7 , press ENTER and the matrix to appear.

[KSSV]

How about this? When elements is prompted, you enter [1 2 5 7]. Type your values in square brackets.

n=input('number of elements =  ')  % n = 4 
a = input('elements-');      % [ 1 2 5 7] 
a=reshape(a,n/2,n/2)'   % not should be even for this example

Answer 2

[Walter Roberson]

% lets say,   A=[1 2 ; 5 7 ] but I want just to write only 1 2 5 7 and press ENTER.
n = input('matrix dimension:')
for i=1:n
  s = input( sprintf('Insert the elements for row #%d, all on one row: ', i), 's');
  a(i,:) = str2double(strsplit("[" + s + "]"));
end

[Venkata Rama Krishna Gona]

I have the values as following

F01=[10;20]
F02=[0;0]
F03=[20;30]
F04=[0;0]

for this i wrote following code

Xp=zeros(f,2);
F=zeros(f,2);
Nu=zeros(1,f);
f=2;
i=1;
while i<=f
        disp(['For force F01',num2str(i)]);
        F0(i)=input('enter the amplittude of forces column matrix in row wise--');
        i=i+1;       
end

Where each time the value is overriding in 'i' but i dont want to. please help me what to do.Thanks

[Walter Roberson]

Are you expecting the user to enter a row of values each time, and are you expecting that the first time the variable F01 will be affected, and that the second iteration the variable F02 would be affected ?

http://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval

[tbaracu]

Just to write all set of elements from the keyboard like 1 5 7 9... then press ENTER and the matrix to be considered by MAtlab.

Example: for matrix [ 1 5 ; 7 9] I want just to write after the FOR instruction is activated, just 1 5 7 9 and the 2 x 2 matrix to be completed.

[tbaracu]

Walter Roberson get closer, but still it is necessary an improvement, because the result looks like this:

matrix dimension:2

n =

2

Insert the elements for row #1, all on one row: 1 5

Insert the elements for row #2, all on one row: 7 9

a =

NaN NaN

NaN NaN

Answer 3

[tbaracu]

It should be something like Matlab after reading 1 5 7 9 initially considers the row matrix [ 1 5 7 9] then split it in two rows to make it [1 5 ; 7 9].

Or, in other example, given from keyboard -----> 1 3 4 7 5 6 1 8 6 -----> press ENTER -----> Matlab initially considers the row matrix [ 1 3 4 7 5 6 1 8 6 ] and split it in 3 rows according to the dim of the matrix to obtain [ 1 3 4 ; 7 5 6 ; 1 8 6 ].