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Showing content from https://arrayfire.org/docs/group__reduce__func__product__by__key.htm below:

ArrayFire: productByKey

Multiply array elements over a given dimension, according to an array of keys. More...

Multiply array elements over a given dimension, according to an array of keys.

The values corresponding to each group of consecutive equal keys will be multiplied together. Keys can repeat; however, only consecutive key values will be considered for each reduction. If a key value is repeated somewhere else in the keys array it will be considered the start of a new reduction. There are two outputs: the reduced set of consecutive keys and the corresponding final set of reduced values.

An example demonstrating the reduction behavior can be seen in the following snippet.

array keys(9, hkeys);

array vals(9, hvals);

array okeys, ovals;

productByKey(okeys, ovals, keys, vals);

The keys' input type must be integer (s32 or u32).

This table defines output types for corresponding input types:

The keys array must be 1-dimenstional matching the size of the reduced dimension. An example of multi-dimensional reduce-by-key can be seen below:

array keys(5, hkeys);

array vals(2, 5, hvals);

const int reduce_dim = 1;

array okeys, ovals;

productByKey(okeys, ovals, keys, vals, reduce_dim);

C Interface to multiply array elements over a given dimension, according to an array of keys.

Parameters

[out] keys_out reduced keys [out] vals_out product [in] keys keys array [in] vals input array [in] dim dimension along which the product occurs

Returns

AF_SUCCESS, if function returns successfully, else an af_err code is given

C Interface to multiply array elements over a given dimension, replacing any NaNs with a specified value, according to an array of keys.

Parameters

[out] keys_out reduced keys [out] vals_out product [in] keys keys array [in] vals input array [in] dim dimension along which the product occurs [in] nanval value that replaces NaNs

Returns

AF_SUCCESS, if function returns successfully, else an af_err code is given

C++ Interface to multiply array elements over a given dimension, replacing any NaNs with a specified value, according to an array of keys.

Parameters

[out] keys_out reduced keys [out] vals_out product [in] keys keys array [in] vals input array [in] dim dimension along which the product occurs [in] nanval value that replaces NaNs

C++ Interface to multiply array elements over a given dimension, according to an array of keys.

Parameters

[out] keys_out reduced keys [out] vals_out product [in] keys keys array [in] vals input array [in] dim dimension along which the product occurs, -1 denotes the first non-singleton dimension

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