MATLAB: What for command or loop is appropriate

forloop

Hi,

I'm going to define a loop which adds a certain value to each row of my 512 rows and 1 column data. The certain value is 0.3, so it must become like this:

0.3

0.6

0.9

0.12

0.15 and so on till the 512th row which is 512*0.3

Anyone knows the for command for this loop? Thanks

Best Answer

no loops needed use cumsum instead:

cumsum(0.3*ones(1,512))

Related Solutions

MATLAB: How can i use a “while” loop to automatically increment omega

I imagine by ‘omega’, you actually intend:

w=(2*pi/5);

A while loop is best used if you want to increment it and then test to see if a specific value meets a specific criterion, and stop the loop when it does.

If you just want to increment it over a range without testing, use a for loop instead.

I experimented with vectorising your code by making ‘omega’ a vector and using element-wise operations where I could. It works for some calculations, but it makes the ‘xx’ calculation impossible. A loop is likely the only way to go.

I could not run this because ‘C’ and ‘a’ are not defined. Correct that, then see if this works for you:

theta=120;
sign=(cosd (theta)/abs (cosd (theta)));
u=.8;
wv = linspace(0, (2*pi/5), 10);                          % Vector Of Values For ‘w’
R=1;
c=4.05/12;
H=18/12;
y=H-(R*sind(theta/2));
Md=50/32.2;
Id=(.5*Md*R^2);
Mp=75/32.2;
Mb=30/32.2;
alpha=0;
u=.8;
L=(6/12*R);
g=32.2;
for k1 = 1:length(wv)
    w = wv(k1);
    ax = (-R*w.^2)*cosd(theta);                             % Modified For Element-Wise Operations


    ab = (-R*w.^2*cosd(theta))-(R*w.^2*sind(theta));        % Modified For Element-Wise Operations
    ay = (-R*w.^2)*sind(theta);                             % Modified For Element-Wise Operations
      AA=[1 0 1 0 0 0 0 0 0; 0 1 0 1 0 0 0 0 0; 0 0 -R*sind(theta) R*cosd(theta) 0 0 0 0 0; 0 0 0 0 1 0 1 0 0; 0 0 0 0 0 1 0 1 0; 0 0 -1 0 -1 0 0 0 0; 0 0 -c 3*R -c -3*R 0 0 0; 0 0 0 0 0 0 0 0 0; 0 0 0 0 0 0 0 0 0];
      CC=[0 Md*g Id*alpha 0 Md*g Id*alpha Mp*ax Mp*ay+Mp*g Mb*g];
      xx=CC*AA;
      if (0<theta) & (theta<180), x{k1} = C*a;
      else xx{k1} = CC*AA
      end
  end

I left ‘x’ and ‘xx’ as cell arrays because I don’t know how large they are.

MATLAB: How to replace values in a matrix

Try a simple for loop:

A=[ 0.2 0.07 0.25 0.87 0.09 0.14 0.8 0.3;
  0.1 0.5 0.25 0.14 0.98 0.025 0.58 0.11;
  0.001 0.25 0.88 0.21 0.03 0.25 0.58 0.25;
  0.26 0.58 0.001 0.06 0.9 0.58 0.44 0.15;
  0.12 0.58 0.16 0.08 0.15 0.47 0.33 0.15;
  0.15 0.22 0.3 0.14 0.01 0.99 0.77 0.55;
  0.003 0.25 0.14 0.99 0.005 0.85 0.26 0.003;
  ];
B=[ 0.25 0.55 0.15 0.02;
  0.001 0.25 0.33 0.04;
  0.2 0.3 0.11 0.58;
  0.25 0.14 0.77 0.69;
  0.88 0.59 0.58 0.001;
  0.02 0.3 0.7 0.8;
  0.3 0.9 0.66 0.11;]
C= [ 8 2 4 1
  1 2 3 4
  7 5 2 8
  1 2 3 4
  2 4 3 7
  1 5 6 7
  2 8 4 1]
[rows, columns] = size(B)
newA = A; % Initialize.
for row = 1 : rows
  newA(row, C(row,:)) = B(row, :);
end
newA % Print in command window to verify

Best Answer

Related Solutions

MATLAB: How can i use a “while” loop to automatically increment omega

MATLAB: How to replace values in a matrix

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