hi, i just started using mathcad. can anyone tell me the mistake i am doing here and how to stack the x[i and y[i into one column matrix. i am using mathcad 15.
Thank you
Solved! Go to Solution.
You can only stack vectors or matrices.
A range variable is NOT a vector (or matrix), it is sort of an iteration operator. You cannot stack range variables.
You can use a range variable to create vectors and matrices, or use them as an index to their elements.
Further use of range variables is in for statements in a mathcad program, and for supplying the independent variable in a plot. I guess that's about it.
In short: you must create vectors, if you want to stack.
Your case: x and y are vectors, and you properly used range variables to create them.
If you want to stack them to create a new vector W just state:
W:= stack(x,y)
Success!
Luc
Some further advice:
The index of the first element of a vector (or row or column of a matrix) is ORIGIN. It's default value is 0, but it can be set to any value (within limits). The most common other value is 1. You can type ORIGIN= to see that (in your case) it's value (is 0).
To display a vector, such as x, instead of x[i= you'd normally just type
x=
With the statement W[i := stack(x[i,y[i) you've instrcuted mathcad to create a new vector W element by element (the iteration operator). The first element (at index 0, so W[0 ) consists of the stacking of x[0 and y[0.
Stacking x[0 and y[0 gives a two element vector (x[0 on top of y[0). The second element of w, that is w[1 becomes a 2-element vector likewise.
When you evaluate W[i, you get this funny display that says each element of W is a vector, 2 rows and 1 column; that is, a 'nested array'.
You can double-click the result and set display properties. Choose 'expand nested arrays' to show its full beauty...
You can only stack vectors or matrices.
A range variable is NOT a vector (or matrix), it is sort of an iteration operator. You cannot stack range variables.
You can use a range variable to create vectors and matrices, or use them as an index to their elements.
Further use of range variables is in for statements in a mathcad program, and for supplying the independent variable in a plot. I guess that's about it.
In short: you must create vectors, if you want to stack.
Your case: x and y are vectors, and you properly used range variables to create them.
If you want to stack them to create a new vector W just state:
W:= stack(x,y)
Success!
Luc
Some further advice:
The index of the first element of a vector (or row or column of a matrix) is ORIGIN. It's default value is 0, but it can be set to any value (within limits). The most common other value is 1. You can type ORIGIN= to see that (in your case) it's value (is 0).
To display a vector, such as x, instead of x[i= you'd normally just type
x=
With the statement W[i := stack(x[i,y[i) you've instrcuted mathcad to create a new vector W element by element (the iteration operator). The first element (at index 0, so W[0 ) consists of the stacking of x[0 and y[0.
Stacking x[0 and y[0 gives a two element vector (x[0 on top of y[0). The second element of w, that is w[1 becomes a 2-element vector likewise.
When you evaluate W[i, you get this funny display that says each element of W is a vector, 2 rows and 1 column; that is, a 'nested array'.
You can double-click the result and set display properties. Choose 'expand nested arrays' to show its full beauty...
Thank you so much. it worked.
First off, you're not stacking range variables. You have one properly defined range variable, " i ", which you're using as an index to create two vectors " x ", and " y ". Then you use the same range variable to create " W ", where W[i := stack(x[i,y[i). This creates a vector of arrays, one element of x is stacked with one element of y to create a two-row, single column array which is one element of W.
The proper command would be W := stack(x,y), which puts the two vectors properly stacked.
thank you