numpy.matrix¶
-
class
numpy.
matrix
[source]¶ Returns a matrix from an array-like object, or from a string of data. A matrix is a specialized 2-D array that retains its 2-D nature through operations. It has certain special operators, such as
*
(matrix multiplication) and**
(matrix power).Parameters: data : array_like or string
If
data
is a string, it is interpreted as a matrix with commas or spaces separating columns, and semicolons separating rows.dtype : data-type
Data-type of the output matrix.
copy : bool
See also
Examples
>>> a = np.matrix('1 2; 3 4') >>> print a [[1 2] [3 4]]
>>> np.matrix([[1, 2], [3, 4]]) matrix([[1, 2], [3, 4]])
Methods
all
([axis, out])Test whether all matrix elements along a given axis evaluate to True. any
([axis, out])Test whether any array element along a given axis evaluates to True. argmax
([axis, out])Indices of the maximum values along an axis. argmin
([axis, out])Return the indices of the minimum values along an axis. argpartition
(kth[, axis, kind, order])Returns the indices that would partition this array. argsort
([axis, kind, order])Returns the indices that would sort this array. astype
(dtype[, order, casting, subok, copy])Copy of the array, cast to a specified type. byteswap
(inplace)Swap the bytes of the array elements choose
(choices[, out, mode])Use an index array to construct a new array from a set of choices. clip
(a_min, a_max[, out])Return an array whose values are limited to [a_min, a_max]
.compress
(condition[, axis, out])Return selected slices of this array along given axis. conj
()Complex-conjugate all elements. conjugate
()Return the complex conjugate, element-wise. copy
([order])Return a copy of the array. cumprod
([axis, dtype, out])Return the cumulative product of the elements along the given axis. cumsum
([axis, dtype, out])Return the cumulative sum of the elements along the given axis. diagonal
([offset, axis1, axis2])Return specified diagonals. dot
(b[, out])Dot product of two arrays. dump
(file)Dump a pickle of the array to the specified file. dumps
()Returns the pickle of the array as a string. fill
(value)Fill the array with a scalar value. flatten
([order])Return a copy of the array collapsed into one dimension. getA
()Return self as an ndarray
object.getA1
()Return self as a flattened ndarray
.getH
()Returns the (complex) conjugate transpose of self. getI
()Returns the (multiplicative) inverse of invertible self. getT
()Returns the transpose of the matrix. getfield
(dtype[, offset])Returns a field of the given array as a certain type. item
(*args)Copy an element of an array to a standard Python scalar and return it. itemset
(*args)Insert scalar into an array (scalar is cast to array’s dtype, if possible) max
([axis, out])Return the maximum value along an axis. mean
([axis, dtype, out])Returns the average of the matrix elements along the given axis. min
([axis, out])Return the minimum value along an axis. newbyteorder
([new_order])Return the array with the same data viewed with a different byte order. nonzero
()Return the indices of the elements that are non-zero. partition
(kth[, axis, kind, order])Rearranges the elements in the array in such a way that value of the element in kth position is in the position it would be in a sorted array. prod
([axis, dtype, out])Return the product of the array elements over the given axis. ptp
([axis, out])Peak-to-peak (maximum - minimum) value along the given axis. put
(indices, values[, mode])Set a.flat[n] = values[n]
for all n in indices.ravel
([order])Return a flattened array. repeat
(repeats[, axis])Repeat elements of an array. reshape
(shape[, order])Returns an array containing the same data with a new shape. resize
(new_shape[, refcheck])Change shape and size of array in-place. round
([decimals, out])Return a with each element rounded to the given number of decimals. searchsorted
(v[, side, sorter])Find indices where elements of v should be inserted in a to maintain order. setfield
(val, dtype[, offset])Put a value into a specified place in a field defined by a data-type. setflags
([write, align, uic])Set array flags WRITEABLE, ALIGNED, and UPDATEIFCOPY, respectively. sort
([axis, kind, order])Sort an array, in-place. squeeze
([axis])Remove single-dimensional entries from the shape of a. std
([axis, dtype, out, ddof])Return the standard deviation of the array elements along the given axis. sum
([axis, dtype, out])Returns the sum of the matrix elements, along the given axis. swapaxes
(axis1, axis2)Return a view of the array with axis1 and axis2 interchanged. take
(indices[, axis, out, mode])Return an array formed from the elements of a at the given indices. tofile
(fid[, sep, format])Write array to a file as text or binary (default). tolist
()Return the matrix as a (possibly nested) list. tostring
([order])Construct a Python string containing the raw data bytes in the array. trace
([offset, axis1, axis2, dtype, out])Return the sum along diagonals of the array. transpose
(*axes)Returns a view of the array with axes transposed. var
([axis, dtype, out, ddof])Returns the variance of the matrix elements, along the given axis. view
([dtype, type])New view of array with the same data.