somas cumulativas parciais dos elementos de uma matriz
y = cumsum(x) y = cumsum(x, 'r') or y = cumsum(x, 1) y = cumsum(x, 'c') or y = cumsum(x, 2) y = cumsum(x, orientation) y = cumsum(.., outtype)
vetor ou matriz de booleanos, inteiros, números reais ou complexos, polinômios ou frações racionais. Hipermatrizes ou matrizes booleanas ou numéricas esparsas também são suportadas.
This argument can be
either a string with possible values "*"
,
"r"
, "c"
or "m"
positive integer 1 ≤ orientation ≤ ndims(x): the index of the dimension along which the partial cumulative sums must be computed. 1 and "r", and 2 and "c", are equivalent.
Word "native"
or "double"
.
Array de tamanho igual ao de x
.
y = cumsum(x) calcula e fornece o parcial
somas cumulativas y(i) = sum(x(1:i))
:
y = cumsum(x, orientation) retorna retorna o parcial somas cumulativas de x ao longo da dimensão dada pela orientation :
Se orientation for igual a 1 ou "r", então
, ou para uma matriz N-Dimensional :
Se orientation for igual a 2 ou "c", então
, ou para uma matriz N-Dimensional :
Se orientation for igual a n, então
y = cumsum(x,"*") is equivalent to
y = cumsum(x)
y = cumsum(x,"m") is equivalent to
y = cumsum(x, orientation)
where orientation
is the index of the first dimension of x that is greater than 1.
This option is used for Matlab compatibility.
The outtype argument rules the way the summations are done:
For arrays of floats, of polynomials, of rational fractions, the evaluation
is always done using floating points computations. The "double"
or "native"
options are equivalent.
For arrays of integers,
if outtype="native"
the evaluation is done using integer
computations (modulo 2^b, where b is the number of bits used),
if outtype="double"
the evaluation is done using floating
point computations.
The default value is outtype="native"
.
For arrays of booleans,
if outtype="native"
the evaluation is done using boolean
computations ( + is replaced by |),
if outtype="double"
the evaluation is done using floating
point computations (%t values are replaced by 1 and %f values by 0).
The default value is outtype="double"
.
![]() | When the input x is sparse, please keep in mind that the density
of the result y will be almost always close to 100%. |