MATLAB: Y = 1./(1+30*x.^2), What does the ./ mean and x.^mean? Kindly guide

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y = 1./(1+30*x.^2), What does the ./ mean and x.^mean? Kindly guide

Best Answer

Such basic questions imply that you need to read the getting started tutorials.

These are element-wise operations, that apply to each element of a pair of vectors or arrays.

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MATLAB: Are we voting enough

I'll vote for a question based on its:

clarity
example data/results
politeness
presence of error messages/specific details

It doesn't matter how advanced or not advanced it is. As far as answers, I'll vote for an answer that provides a good reference or working example/explanation, e.g:

doc so_and_so_function
http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
F = zeros(size(k)); %preallocate for speed

MATLAB: I’d like to delete 24th one of “for 1:1:30”

There are a number of different ways:

for K = 1 : 30   %#1

  if K == 24; continue; end
  ...
end
for K = setdiff(1:30,24)  %#2

  ...
end
KV = 1:30; KV(24) = [];  %#3

for K = KV
  ...
end

For your second question, again there are multiple ways:

function r = somefunction(v)  %#1
  if v < 0
    r = 1;
  else
    r = 0;
  end
end
function r = somefunction(v)  %#2
  r = 0 + (v < 0);
end
somefunction = @(v) v < 0;    %#3

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MATLAB: Are we voting enough

MATLAB: I’d like to delete 24th one of “for 1:1:30”

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