How Do I Create a Regularly-Spaced Array of Values in Matlab?
How Do I Make an Array That's Defined with a Start Point, an End Point, and a Total Array Size? Something Like an Array That Goes from 1 to 10 That's 20...
How do I make an array that's defined with a start point, an end point, and a total array size? Something like an array that goes from 1 to 10 that's 20 elements long. For example, the array could look something like:
1 1.5 2 2.5 3 3.5 ...
3 Answers
There are a couple of ways you can do this:
Using the colon operator:
startValue = 1; endValue = 10; nElements = 20; stepSize = (endValue-startValue)/(nElements-1); A = startValue:stepSize:endValue;Using the
linspacefunction (as suggested by Amro):startValue = 1; endValue = 10; nElements = 20; A = linspace(startValue,endValue,nElements);
Keep in mind that the number of elements in the resulting arrays includes the end points. In the above examples, the difference between array element values will be 9/19, or a little less than 0.5 (unlike the sample array in the question).
linspace generates linearly spaced vectors:
>> A = linspace(1, 10, 20-1)
ans =
1 1.5 2 2.5 3 3.5 ... 9.5 10
Simple one-liner!
1:0.5:10;
Output:
1 1.5 2 2.5 ... 9 9.5 10
Note that this would be a 19-element vector, not 20.
Sarah Jenkins is a veteran tech journalist with over 12 years of experience covering artificial intelligence, mobile innovations, and digital ethics. Her insights have appeared in leading technology publications worldwide.
