Creating a matrix with for loop
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Harin Nelumdeniya
on 27 Apr 2018
Commented: Harin Nelumdeniya
on 28 Apr 2018
I need to create a matrix that increases or decreases in size with the change in variable n. The matrix should be having only one column and the number of rows need to change with the n value.
The inputs are n, (dx=L/n), L. The matrix that needs to be created should be [0;dx/2;(dx/2+dx);((dx/2+dx)+dx);(((dx/2+dx)+dx)+dx);.....;0.5].
The fourth value of the matrix is simply the third value +dx, this should go on until it reaches 0.5. I can't seem to work out how to make a for loop for this problem.
The number of values in between 0 and 0.5 should also be equal to the n value, so if the n value is 8 the number of values in between should also be 8.
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Accepted Answer
Stephen23
on 27 Apr 2018
Edited: Stephen23
on 27 Apr 2018
"It should definitely be a for loop. I don't think such a matrix can be produced using for loop"
[0,dx/2:dx:L,L].'
Try it yourself, I don't see any difference from what you requested (shown in vector A):
>> n = 8;
>> L = 0.5;
>> dx = L/n;
>> A = [0;dx/2;dx/2+dx;dx/2+2*dx;dx/2+3*dx;dx/2+4*dx;dx/2+5*dx;dx/2+6*dx;dx/2+7*dx;0.5];
>> B = [0,dx/2:dx:L,L].';
>> [A,B]
ans =
0.00000 0.00000
0.03125 0.03125
0.09375 0.09375
0.15625 0.15625
0.21875 0.21875
0.28125 0.28125
0.34375 0.34375
0.40625 0.40625
0.46875 0.46875
0.50000 0.50000
>> A-B
ans =
0
0
0
0
0
0
0
0
0
0
Why do you need to use a loop?
3 Comments
Stephen23
on 27 Apr 2018
Edited: Stephen23
on 27 Apr 2018
It works when I try it:
>> n = 5;
>> L = 0.5;
>> dx = L/n;
>> [0,dx/2:dx:L,L].'
ans =
0.00000
0.05000
0.15000
0.25000
0.35000
0.45000
0.50000
This gives five values between 0 and L, just as requested. And this gives ten, just as requested:
>> n = 10;
>> L = 0.5;
>> dx = L/n;
>> [0,dx/2:dx:L,L].'
ans =
0.00000
0.02500
0.07500
0.12500
0.17500
0.22500
0.27500
0.32500
0.37500
0.42500
0.47500
0.50000
I still don't see why you think that you need a loop.
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