.qtk.utils
.qtk.utils.intToVectorByBase¶
Get vector representation of an integer by given base. It's the reverse of .qtk.utils.vectorToIntByBase, and It's an alias of vs.
Parameters:
| Name | Type | Description |
|---|---|---|
| base | short | int | long | Base. |
| int | short | int | long | An integer. |
Returns:
| Type | Description |
|---|---|
| long[] | Vector representation of the integer by the base. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["utils";`qtk];
2 3 5 7~.qtk.utils.intToVectorByBase[10; 2357]
.qtk.utils.intToVectorByBases¶
Get vector representation of an integer by given bases. It's the reverse of .qtk.utils.vectorToIntByBases, and It's an alias of vs.
Parameters:
| Name | Type | Description |
|---|---|---|
| bases | short[] | int[] | long[] | Bases. |
| int | short | int | long | An integer. |
Returns:
| Type | Description |
|---|---|
| long[] | Vector representation of the integer by given bases. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["utils";`qtk];
2 3 5 7~.qtk.utils.intToVectorByBases[0W 24 60 60; 183907] // 2 days, 3 hours, 5 minutes, 7 seconds
.qtk.utils.nameExists¶
Check if a name is in use. It's an alias of key.
Parameter:
| Name | Type | Description |
|---|---|---|
| name | symbol | Variable name. |
Returns:
| Type | Description |
|---|---|
| boolean | 1b if the name is in use; 0b otherwise. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["tbl";`qtk];
not .qtk.utils.nameExists `noexist
.qtk.utils.raiseIfNameExists¶
Raise NameExistsError if a name is in use.
Parameter:
| Name | Type | Description |
|---|---|---|
| name | symbol | Variable name. |
Throws:
| Type | Description |
|---|---|
| NameExistsError | If the name is in use. |
.qtk.utils.toBoolsByInt¶
Get bit (boolean) representation of a byte/short/int/long. It's the reverse of .qtk.utils.toIntByBools and similar to vs but leave out the first argument.
Parameter:
| Name | Type | Description |
|---|---|---|
| int | byte | short | int | long | A byte or short/int/long integer. |
Returns:
| Type | Description |
|---|---|
| boolean[] | Bit representation of the byte or integer. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["utils";`qtk];
(8#1b)~.qtk.utils.toBoolsByInt 0xff
.qtk.utils.toBytesByInt¶
Get byte representation of a short/int/long. It's the reverse of .qtk.utils.toIntByBytes and similar to vs but leaves out the first argument.
Parameter:
| Name | Type | Description |
|---|---|---|
| int | short | int | long | A short/int/long integer. |
Returns:
| Type | Description |
|---|---|
| byte[] | Byte representation of the integer. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["utils";`qtk];
0x0101~.qtk.utils.toBytesByInt 257h
.qtk.utils.toIntByBools¶
Get byte/short/int/long from its bit (boolean) representation. It's the reverse of .qtk.utils.toBoolsByInt and similar to sv but leaves out the first argument.
Parameter:
| Name | Type | Description |
|---|---|---|
| vector | boolean[] | Length-8/16/32/64 boolean vector. |
Returns:
| Type | Description |
|---|---|
| byte | short | int | long | The corresponding byte or integer represented by the boolean array. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["utils";`qtk];
0xff=.qtk.utils.toIntByBools 8#1b
.qtk.utils.toIntByBytes¶
Get short/int/long from its byte representation. It's the reverse of .qtk.utils.toBytesByInt, and similar to sv but leaves out the first argument.
Parameter:
| Name | Type | Description |
|---|---|---|
| vector | byte[] | Length-2/4/8 byte vector. |
Returns:
| Type | Description |
|---|---|
| short | int | long | The corresponding integer represented by the byte array. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["utils";`qtk];
257h=.qtk.utils.toIntByBytes 0x0101
.qtk.utils.vectorToIntByBase¶
Get integer representation of a vector by given base. It's the reverse of .qtk.utils.intToVectorByBase, and It's an alias of sv.
Parameters:
| Name | Type | Description |
|---|---|---|
| base | short | int | long | Base. |
| vector | byte[] | short[] | int[] | long[] | Encoded vector. |
Returns:
| Type | Description |
|---|---|
| long | An integer by evaluating the vector to the base. |
Example:
system "l ",getenv[`QTK],"/init.q";
.qtk.import.loadModule["utils";`qtk];
2357=.qtk.utils.vectorToIntByBase[10; 2 3 5 7]
.qtk.utils.vectorToIntByBases¶
Get integer representation of an vector by given bases. It's the reverse of .qtk.utils.intToVectorByBases, and It's an alias of sv.
Parameters:
| Name | Type | Description |
|---|---|---|
| bases | short[] | int[] | long[] | Bases. |
| vector | byte[] | short[] | int[] | long[] | Encoded vector. |
Returns:
| Type | Description |
|---|---|
| long | Integer representation of the vector by the bases. The first of the bases is not used in the calculation, as the coefficient for the last of the vector is always 1. |
Example: