6809 Assembly Language Programming by Lance A Leventhal

By Lance A Leventhal

Guide textual content for meeting language geared in the direction of the Motorola 6809 microprocessor that is present in the Tandy TRS-80 machine.

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In general, if you don't do this, your program will leak memory. This may result in the program crashing, or the memory of the computer filling up, causing it to slow dramatically. To avoid this situation, it is good practice to insert a deallocate statement whenever you insert an allocate statement, to ensure that they remain balanced. Allocatable arrays are not restricted to a single dimension. 0 print *, r(6,6) deallocate(r) end If you ever need to test whether an allocatable array has already been allocated, you can use the allocated intrinsic function.

Use an if statement inside the do loop to update these variables each iteration as necessary. 3. Element-wise Operations More recent versions of Fortran support array operations, which can eliminate many loops. For example, you can assign an array to a constant or another array of the same shape, and all elements will be assigned. 1 b = a Assigning an array to scalar, as in the second line above, causes all elements of the array to be set to that scalar value. 1 enddo When you assign an array to another array of the same shape, each element of one is assigned to its corresponding element in the other array, similar to this loop do i = 1, 10 b(i) = a(i) enddo This works for both one-dimensional and multi-dimensional arrays, so you can also do this real a(2,2), b(5:6, 5:6) call random_number(a) b = a In this example, the arrays a and b have the same shape, but different indexes.

Gives 3 There are a lot of useful routines in the table above, but it won't be immediately obvious to you how some of them can be used. To get the ball rolling, we will now give a few practical examples of some of the array intrinsics. It should be fairly obvious that some of the matrix operations are useful, but they become really powerful when you start to combine them in expressions. For example, imagine you need to perform a similarity transform; perhaps you have diagonalized a matrix, and want to transform some coefficients from the original space to the eigenspace.

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