excel functions for compiling data - vstack & hstack!

The functions `hstack` and `vstack` are commonly used in programming, especially in the context of arrays or matrices, to horizontally or vertically stack arrays or matrices, respectively.

1. hstack:
- `hstack` stands for "horizontal stack."
- It is used to concatenate arrays or matrices along the horizontal axis.
- When you use `hstack`, the arrays or matrices should have the same number of rows, as you are stacking them horizontally.
- For example, if you have two arrays `A` and `B` with dimensions `(m, n)` and `(m, p)` respectively, where `m` is the number of rows, `n` is the number of columns in `A`, and `p` is the number of columns in `B`, then `hstack` will return a new array with dimensions `(m, n+p)` that horizontally concatenates `A` and `B`.

2. vstack:
- `vstack` stands for "vertical stack."
- It is used to concatenate arrays or matrices along the vertical axis.
- When you use `vstack`, the arrays or matrices should have the same number of columns, as you are stacking them vertically.
- For example, if you have two arrays `A` and `B` with dimensions `(m, n)` and `(q, n)` respectively, where `m` is the number of rows in `A`, `q` is the number of rows in `B`, and `n` is the number of columns, then `vstack` will return a new array with dimensions `(m+q, n)` that vertically concatenates `A` and `B`.

In both cases, the resulting stacked array or matrix will have the appropriate shape based on the axis along which the stacking is performed. It's important to ensure that the dimensions of the arrays or matrices are compatible for stacking, otherwise, you may encounter errors or unexpected results.

These functions are commonly available in various programming languages and libraries, such as NumPy in Python, where they are used for array manipulation and data analysis tasks.

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