Today I am going to write about an HP Prime function
I have found really useful:
REDIM: This
function allows to change the size of either a matrix or a vector, adding null
spaces to them without deleting the numbers stored previously.
- The syntax is:
- REDIM(name of the matrix,{number of rows, number of columns})
- REDIM(name of the vector,{length})
This function is really useful in program that you
do not know the size of the matrix beforehand and you have to ask the user.
For
example, for obtaining the impedance and admittance matrices of an overhead
power line:
Please NOTE that for entering a vector in a program
you must enter the data inside the vector, i.e. the scalar multiplication
property does not apply:
A good example are when the overhead power line is
in staggered rows, in which the easiest way to put coordinates are:
Another WARNING is to create a vector you always
have to press the button (,).
Otherwise, if you press the ± the calculator will make a matrix and the
functions will not work.
