Equally increasing decimal numbers in an array

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Olivia Milton-thompson 2015-11-15

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评论： Star Strider 2015-11-15

Hello! This might be super simple but I keep seem to find an elegant way of doing this.

I simply want an array to list numbers consecutively between 0.1 and 1.0 going up in intervals of 0.1. I can't write it as 0.1:1 because it won't go up in increments of 0.1.

Does anyone know a simple way of doing this?

Thank you!

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Answer 1

Star Strider 2015-11-15

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Yes. You can supply a ‘step’ to the colon operator to produce whatever step values you want in your vector:

v = 0.1:0.1:1;

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Olivia Milton-thompson 2015-11-15

Brilliant, thank you! I thought it was something like that but I couldn't get it to work! I assume the middle 0.1 is the increment?

Star Strider 2015-11-15

Thank you! My pleasure!

Correct. The middle 0.1 here is the step. (If you don’t specificallly state the step, the default step is 1.)

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Answer 2

Image Analyst 2015-11-15

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You have to give a starting value, a step, and an ending value - you gave only two of those, which it takes as starting value and ending value, so use all three startingValue:stepValue:endingValue, or 0.1 : 0.1 : 1 (like Star said). Alternatively, you should know about this useful little utility called linspace(). It's similar except that you specify how many steps you want and it computes the step size for you. let's say you wanted 10 steps between 0.1 and 1.0. Then you could do

v = linspace(0.1, 1.0, 10); % linspace(start, stop, numSteps)

Both methods have their uses and you'll probably use both in the future.

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Star Strider 2015-11-15

The key difference is that the colon operator uses a fixed step, so the vector length will vary. The linspace function specifies a fixed length, and adjusts vector step size to fit the length.

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