How do you create vectors with specific intervals in R

Question

I have a question about creating vectors  If I do a  lt - 1 10   a  has the values 1 2 3 4 5 6 7 8 9 10   My question is how do you create a vector with specific intervals between its elements  For example  I would like to create a vector that has the values from 1 to 100 but only count in intervals of 5 so that I get a vector that has the values 5 10 15 20     95 100  I think that in Matlab we can do 1 5 100  how do we do this using R   I could try doing 5  1 20  but is there a shorter way   since in this case I would need to know the whole length  100  and then divide by the size of the interval  5  to get the 20

User · Accepted Answer

In R the equivalent function is seq and you can use it with the option by   seq from   5  to   100  by   5     1    5  10  15  20  25  30  35  40  45  50  55  60  65  70  75  80  85  90  95 100     In addition to by you can also have other options such as length out and along with   length out  If you want to get a total of 10 numbers between 0 and 1  for example   seq 0  1  length out   10    gives 10 equally spaced numbers from 0 to 1   along with  It takes the length of the vector you supply as input and provides a vector from 1 length input    seq along with c 10 20 30      1  1 2 3   Although  instead of using the along with option  it is recommended to use seq along in this case  From the documentation for  seq     seq is generic  and only the default method is described here  Note that it dispatches on the class of the first argument irrespective of argument names  This can have unintended consequences if it is called with just one argument intending this to be taken as along with  it is much better to use seq along in that case    seq along  Instead of seq along with      seq along c 10 20 30      1  1 2 3   Hope this helps

User · Answer

Use the code  x   seq 0 100 5   this means  starting number  ending number  interval    the output will be    1    0   5  10  15  20  25  30  35  40  45  50  55  60  65  70  75  17   80  85  90  95 100

User · Answer

Usually  we want to divide our vector into a number of intervals   In this case  you can use a function where  a  is a vector and   b  is the number of intervals   Let s suppose you want 4 intervals   a  lt - 1 10 b  lt - 4  FunctionIntervalM  lt - function a b      seq from min a   to   max a   by    max a -min a   b     FunctionIntervalM a b    1 00  3 25  5 50  7 75 10 00   Therefore you have 4 intervals   1 00 - 3 25  3 25 - 5 50 5 50 - 7 75 7 75 - 10 00   You can also use a cut function     cut a  4      0 991 3 25   0 991 3 25   0 991 3 25   3 25 5 5     3 25 5 5     5 5 7 75       5 5 7 75     7 75 10      7 75 10      7 75 10      Levels   0 991 3 25   3 25 5 5   5 5 7 75   7 75 10

[r] How do you create vectors with specific intervals in R?

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