Array creation routines¶
See also
Ones and zeros¶
| empty (shape[, dtype, order]) | Return a new array of given shape and type, without initialising entries. |
| empty_like (a) | Create a new array with the same shape and type as another. |
| eye (N[, M, k, dtype]) | Return a 2-D array with ones on the diagonal and zeros elsewhere. |
| identity (n[, dtype]) | Return the identity array. |
| ones (shape[, dtype, order]) | Return a new array of given shape and type, filled with ones. |
| ones_like (x[, out]) | Returns an array of ones with the same shape and type as a given array. |
| zeros (shape[, dtype, order]) | Return a new array of given shape and type, filled with zeros. |
| zeros_like (a) | Returns an array of zeros with the same shape and type as a given array. |
From existing data¶
| array (object[, dtype, copy, order, ...]) | Create an array. |
| asarray (a[, dtype, order]) | Convert the input to an array. |
| asanyarray (a[, dtype, order]) | Convert the input to a ndarray, but pass ndarray subclasses through. |
| ascontiguousarray (a[, dtype]) | Return a contiguous array in memory (C order). |
| asmatrix (data[, dtype]) | Interpret the input as a matrix. |
| copy (a) | Return an array copy of the given object. |
| frombuffer (buffer[, dtype, count, offset]) | Interpret a buffer as a 1-dimensional array. |
| fromfile (file[, dtype, count, sep]) | Construct an array from data in a text or binary file. |
| fromfunction (function, shape, **kwargs) | Construct an array by executing a function over each coordinate. |
| fromiter (iterable, dtype[, count]) | Create a new 1-dimensional array from an iterable object. |
| loadtxt (fname[, dtype, comments, ...]) | Load data from a text file. |
Creating record arrays (numpy.rec)¶
Note
numpy.rec is the preferred alias for numpy.core.records.
| core.records.array (obj[, dtype, shape, offset, ...]) | Construct a record array from a wide-variety of objects. |
| core.records.fromarrays (arrayList[, dtype, shape, formats, ...]) | create a record array from a (flat) list of arrays |
| core.records.fromrecords (recList[, dtype, shape, formats, ...]) | create a recarray from a list of records in text form |
| core.records.fromstring (datastring[, dtype, shape, offset, ...]) | create a (read-only) record array from binary data contained in a string |
| core.records.fromfile (fd[, dtype, shape, offset, ...]) | Create an array from binary file data |
Creating character arrays (numpy.char)¶
Note
numpy.char is the preferred alias for numpy.core.defchararray.
| core.defchararray.array (obj[, itemsize, copy, ...]) |
Numerical ranges¶
| arange ([start,] stop[, step, ...]) | Return evenly spaced values within a given interval. |
| linspace (start, stop[, num, endpoint, retstep]) | Return evenly spaced numbers over a specified interval. |
| logspace (start, stop[, num, endpoint, base]) | Return numbers spaced evenly on a log scale. |
| meshgrid (x, y) | Return coordinate matrices from two coordinate vectors. |
| mgrid | Construct a multi-dimensional filled “meshgrid”. |
Building matrices¶
| diag (v[, k]) | Extract a diagonal or construct a diagonal array. |
| diagflat (v[, k]) | Create a 2-dimensional array with the flattened input as a diagonal. |
| tri (N[, M, k, dtype]) | Construct an array filled with ones at and below the given diagonal. |
| tril (m[, k]) | Lower triangle of an array. |
| triu (m[, k]) | Upper triangle of an array. |
| vander (x[, N]) | Generate a Van der Monde matrix. |
