MATLAB: Question of for loop

for loop

for i=1:10 power=(i*i) end; this is my programme and ,now i want to calculate all the values of power.

Best Answer

Do you have a question, other than "How do I format my code?" which is answered by this. Might it be "How do I get power to be an array?" If so, just make * a .* and drop the "for" and "end".

k = 1 : 10;  % No "for" needed since it's now vectorized.
power = k .* k  % or can use power = k .^2

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MATLAB: Question of applying sum() to the matrix with zero values

You've probably used sum as a variable in your code. Try this

clear sum
X=[1 0 0 ;0 0 0;0 9 0]
sum(X)

MATLAB: Making a matlab GUI. Display all values taken from an iterative loop on a static Text

k = 15;  
n = 1;
i = 0;
allK = [];
while k > n
  if mod(k, 2) == 0  % Not "mood"!
    k = k / 2;
  else
    k = (k * 3) + 1;
  end
  i       = i + 1;
  allK(i) = k;     % A warning will appear in the editor
end 
set(handles.mytext, 'String', sprintf('%d\n', allK));

Now allK grows iteratively. This is very expensive if the resulting array is large, e.g. for 1e6 elements. For your problem, the delay is negligible. A pre-allocation is not trivial here, because you cannot know how many elements are created by this function. But it is better to pre-allocate with a poor too large estimation:

allK = zeros(1, 1e6);   % instead of: allK = [];
set(handles.mytext, 'String', sprintf('%d\n', allK(1:i)));

Alternatively you can assign a cell string to the 'String' property also instead of inserting line breaks:

set(handles.mytext, 'String', sprintfc('%d', allK(1:i)));

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Related Solutions

MATLAB: Question of applying sum() to the matrix with zero values

MATLAB: Making a matlab GUI. Display all values taken from an iterative loop on a static Text

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