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Hello i want to know if exist a function that generate numbers in a range that i want to fix. for example i need to generate 22 numbers in this range: 0.5000 and 0.600

can you help me? thank you

[Aldin]

Here:

0.5:0.1/20:0.6

Answer 1

[Aldin]

Here:

0.5:0.1/20:0.6

Beacuase: (0.6 - 0.5)/20

[Oleg Komarov]

Actually it's:

a = 0.5:0.1/21:0.6;

Alternatively a high level function (which uses the engine showed by Aldin)

b = linspace(.5,.6,22);

[Geoff]

Using linspace to generate a series is preferable here because it has more transparent semantics. _ie_ "I want 22 values between A and B". It's also easier to change the range without introducing errors. What if you decided you needed to go between 0.5 and 0.7? How will you make sure you don't make a mistake with the colon operator?

[Aldin]

Hi Oleg, when yout write 0.1/21 the length of the vector is 23 not 22

[Oleg Komarov]

In my case is 22.

[Geoff]

Oleg is correct: length( 0.5:0.1/20:0.6 ) is 21. You really should use linspace if you want a linear sequence with a specified number of elements. That's what it's there for.

Answer 2

[Geoff]

You haven't really specified if you want a sequence or just a set of numbers. Picking up on your term 'generate', perhaps you meant this:

randarr = @(lo, hi, n) lo + (hi-lo) * rand(1,n);
data = randarr(0.5, 0.6, 22);

That creates a bunch of random numbers in your specified range. Note I've wrapped it in an anonymous function to give the same syntax as linspace.

[Geoff]

Oops, just realised I specified that anonymous function incorrectly. Fixed.