The RATS Software Forum

Trying to stack two matrices into one, but no success for days. Can anyone help me to see which part goes wrong? Thanks.

Here is my program and output:
[1] DISP TR(ALPHAORT)
0.97456 0.22411 9.39326e-04 0.00000
0.01159 -0.05039 0.00239 0.99866

[2] DISP TR(%ALPHA1)*INV(OMEGA)
6662.33384 -27012.07346 -69.40077 -7486.57001
-6401.24550 8461.91272 192.20440 -19015.56708

[3] COMP IDLEFT = || TR(ALPHAORT) | TR(%ALPHA1)*INV(OMEGA) ||
[4] COMP IDRIGHT = || TR(%ALPHA1)*GAMMA*GY | %ZEROS(%R,1) ||
[5] DISP IDLEFT
0.97456
9.39326e-04 0.00000
6662.33384
-6401.24550 8461.91272
==> I thought IDLEFT will be a 4x4 matrix. The outcome is not right.

[6] DISP IDRIGHT
-368.27392
-692.51845
0.00000
0.00000


[7] COMP SOL = INV(IDLEFT)*IDRIGHT
Can't Find Match for INV(RECTANGULAR(REAL)). Closest Match is INV(MATRIX(REAL))
## SX27. Illegal Combination of Data Types for Operation
>>>>P SOL = INV(IDLEFT)<<<<


Furthermore, if there is a variable, whenever I try to re-declare it shows
## SX1. Identifier A is Already in use as a(n) RECTANGULAR(REAL)
How do I release it and change it to a new type?
I tried RELEASE, but had no success.

With Version 7, you can use the new matrix concatenation operators to stack arrays. With older versions, you need to use the %BLOCKGLUE function to do this (you can also use an EWISE command with a %IF function or COMPUTE commands inside a DO loop, but the concatenation operator or %BLOCKGLUE function are easier).

With respect to re-declaring a variable as a different type, you can't change the type of a variable within a given program or session. You would need to clear the memory (using File-Clear Program or the "Clear Program" toolbar) and start fresh.

You can re-dimension an array without clearing the memory. For example, if you have a (5,5) rectangular array, you could re-dimension it as (10,10) or (2,8), etc. You just can't change the type.

Thank you so much.