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Quick start¶
This section provides a quick introduction to scipp
. For in depth explanations refer to the sections in the user guide.
[1]:
import numpy as np
import scipp as sc
We start by creating some variables:
[2]:
var = sc.Variable(dims=['y', 'x'], values=np.random.rand(4,5))
sc.show(var)
Type the name of a variable at the end of a cell to generate an HTML respresentation:
[3]:
var
[3]:
- (y: 4, x: 5)float640.36, 0.19, ..., 0.1, 0.56
Values:
array([[0.35620622, 0.19304515, 0.66822755, 0.9621907 , 0.03204145], [0.94979449, 0.13841741, 0.27123956, 0.57415605, 0.84638204], [0.89359542, 0.79761112, 0.63548611, 0.61090044, 0.30631625], [0.92824375, 0.75823889, 0.74209011, 0.10439147, 0.56136769]])
[4]:
x = sc.Variable(dims=['x'], values=np.arange(5), unit=sc.units.m)
y = sc.Variable(dims=['y'], values=np.arange(4), unit=sc.units.m)
We combine the variables into a data array:
[5]:
array = sc.DataArray(
data=var,
coords={'x': x, 'y': y})
sc.show(array)
array
[5]:
- y: 4
- x: 5
- x(x)int64m0, 1, 2, 3, 4
Values:
array([0, 1, 2, 3, 4]) - y(y)int64m0, 1, 2, 3
Values:
array([0, 1, 2, 3])
- (y, x)float640.36, 0.19, ..., 0.1, 0.56
Values:
array([[0.35620622, 0.19304515, 0.66822755, 0.9621907 , 0.03204145], [0.94979449, 0.13841741, 0.27123956, 0.57415605, 0.84638204], [0.89359542, 0.79761112, 0.63548611, 0.61090044, 0.30631625], [0.92824375, 0.75823889, 0.74209011, 0.10439147, 0.56136769]])
Variables can have uncertainties. Scipp stores these as variances (the square of the standard deviation):
[6]:
array.variances = np.square(np.random.rand(4,5))
sc.show(array)
We create a dataset:
[7]:
dataset = sc.Dataset(
data={'a': var},
coords={'x': x, 'y': y, 'aux': x})
dataset['b'] = array
dataset['scalar'] = 1.23 * (sc.units.m / sc.units.s)
sc.show(dataset)
We can slice variables, data arrays, and datasets using a dimension label and an index or a slice object like i:j
:
[8]:
dataset['c'] = dataset['b']['x', 2]
sc.show(dataset)
dataset
[8]:
- y: 4
- x: 5
- aux(x)int64m0, 1, 2, 3, 4
Values:
array([0, 1, 2, 3, 4]) - x(x)int64m0, 1, 2, 3, 4
Values:
array([0, 1, 2, 3, 4]) - y(y)int64m0, 1, 2, 3
Values:
array([0, 1, 2, 3])
- a(y, x)float640.36, 0.19, ..., 0.1, 0.56σ = 0.56, 0.42, ..., 0.73, 0.1
Values:
array([[0.35620622, 0.19304515, 0.66822755, 0.9621907 , 0.03204145], [0.94979449, 0.13841741, 0.27123956, 0.57415605, 0.84638204], [0.89359542, 0.79761112, 0.63548611, 0.61090044, 0.30631625], [0.92824375, 0.75823889, 0.74209011, 0.10439147, 0.56136769]])
Variances (σ²):
array([[0.31252281, 0.1786297 , 0.10900878, 0.76808841, 0.63674344], [0.01641601, 0.6308399 , 0.10583196, 0.51720851, 0.33267364], [0.39508017, 0.62752704, 0.9755135 , 0.10787153, 0.40062838], [0.01848075, 0.03640689, 0.80584553, 0.52729343, 0.01014745]]) - b(y, x)float640.36, 0.19, ..., 0.1, 0.56σ = 0.56, 0.42, ..., 0.73, 0.1
Values:
array([[0.35620622, 0.19304515, 0.66822755, 0.9621907 , 0.03204145], [0.94979449, 0.13841741, 0.27123956, 0.57415605, 0.84638204], [0.89359542, 0.79761112, 0.63548611, 0.61090044, 0.30631625], [0.92824375, 0.75823889, 0.74209011, 0.10439147, 0.56136769]])
Variances (σ²):
array([[0.31252281, 0.1786297 , 0.10900878, 0.76808841, 0.63674344], [0.01641601, 0.6308399 , 0.10583196, 0.51720851, 0.33267364], [0.39508017, 0.62752704, 0.9755135 , 0.10787153, 0.40062838], [0.01848075, 0.03640689, 0.80584553, 0.52729343, 0.01014745]]) - c(y)float640.67, 0.27, 0.64, 0.74σ = 0.33, 0.33, 0.99, 0.9
- aux()int64m2
Values:
array(2) - x()int64m2
Values:
array(2)
Values:
array([0.66822755, 0.27123956, 0.63548611, 0.74209011])
Variances (σ²):
array([0.10900878, 0.10583196, 0.9755135 , 0.80584553]) - scalar()float64m/s1.23
Values:
array(1.23)
We can also generate table representations (only 0-D and 1-D) and plots:
[9]:
sc.table(dataset['y', 2])
[10]:
sc.plot(dataset)
Arithmetic operations can be combined with slicing and handle propagation of uncertainties and units:
[11]:
print(dataset)
<scipp.Dataset>
Dimensions: Sizes[y:4, x:5, ]
Coordinates:
aux int64 [m] (x) [0, 1, ..., 3, 4]
x int64 [m] (x) [0, 1, ..., 3, 4]
y int64 [m] (y) [0, 1, 2, 3]
Data:
a float64 [dimensionless] (y, x) [0.356206, 0.193045, ..., 0.104391, 0.561368] [0.312523, 0.178630, ..., 0.527293, 0.010147]
b float64 [dimensionless] (y, x) [0.356206, 0.193045, ..., 0.104391, 0.561368] [0.312523, 0.178630, ..., 0.527293, 0.010147]
c float64 [dimensionless] (y) [0.668228, 0.271240, 0.635486, 0.742090] [0.109009, 0.105832, 0.975513, 0.805846]
Attributes:
aux int64 [m] () [2]
x int64 [m] () [2]
scalar float64 [m/s] () [1.230000]
[12]:
dataset['b']['y', 0:2] -= dataset['y', 0:2]['a']['x', 0]
dataset['b'] *= dataset['scalar']
print(dataset)
<scipp.Dataset>
Dimensions: Sizes[y:4, x:5, ]
Coordinates:
aux int64 [m] (x) [0, 1, ..., 3, 4]
x int64 [m] (x) [0, 1, ..., 3, 4]
y int64 [m] (y) [0, 1, 2, 3]
Data:
a float64 [m/s] (y, x) [0.000000, -0.200688, ..., 0.128402, 0.690482] [0.945632, 0.743065, ..., 0.797742, 0.015352]
b float64 [m/s] (y, x) [0.000000, -0.200688, ..., 0.128402, 0.690482] [0.945632, 0.743065, ..., 0.797742, 0.015352]
c float64 [m/s] (y) [0.383786, -0.834623, 0.781648, 0.912771] [0.637735, 0.184949, 1.475854, 1.219164]
Attributes:
aux int64 [m] () [2]
x int64 [m] () [2]
scalar float64 [m/s] () [1.230000]
Finally, type the imported name of the scipp
module at the end of a cell for a list of all current scipp objects (variables, data arrays, datasets). Click on entries to expand nested sections:
[13]:
sc
Variables:(3)
var
- (y: 4, x: 5)float64m/s0.0, -0.2, ..., 0.13, 0.69σ = 0.97, 0.86, ..., 0.89, 0.12
Values:
array([[ 0. , -0.20068812, 0.38378623, 0.7453609 , -0.39872267], [ 0. , -0.9979938 , -0.83462256, -0.46203528, -0.12719731], [ 1.09912236, 0.98106168, 0.78164792, 0.75140754, 0.37676899], [ 1.14173982, 0.93263384, 0.91277084, 0.12840151, 0.69048226]])
Variances (σ²):
array([[0.94563151, 0.74306463, 0.63773513, 1.63485672, 1.43614491], [0.04967157, 0.97923347, 0.18494896, 0.80732054, 0.52813774], [0.59771679, 0.94938567, 1.47585437, 0.16319883, 0.60611068], [0.02795953, 0.05507998, 1.21916371, 0.79774224, 0.01535208]])
x
- (x: 5)int64m0, 1, 2, 3, 4
Values:
array([0, 1, 2, 3, 4])
y
- (y: 4)int64m0, 1, 2, 3
Values:
array([0, 1, 2, 3])
DataArrays:(1)
array
- y: 4
- x: 5
- x(x)int64m0, 1, 2, 3, 4
Values:
array([0, 1, 2, 3, 4]) - y(y)int64m0, 1, 2, 3
Values:
array([0, 1, 2, 3])
- (y, x)float64m/s0.0, -0.2, ..., 0.13, 0.69σ = 0.97, 0.86, ..., 0.89, 0.12
Values:
array([[ 0. , -0.20068812, 0.38378623, 0.7453609 , -0.39872267], [ 0. , -0.9979938 , -0.83462256, -0.46203528, -0.12719731], [ 1.09912236, 0.98106168, 0.78164792, 0.75140754, 0.37676899], [ 1.14173982, 0.93263384, 0.91277084, 0.12840151, 0.69048226]])
Variances (σ²):
array([[0.94563151, 0.74306463, 0.63773513, 1.63485672, 1.43614491], [0.04967157, 0.97923347, 0.18494896, 0.80732054, 0.52813774], [0.59771679, 0.94938567, 1.47585437, 0.16319883, 0.60611068], [0.02795953, 0.05507998, 1.21916371, 0.79774224, 0.01535208]])
Datasets:(1)
dataset
- y: 4
- x: 5
- aux(x)int64m0, 1, 2, 3, 4
Values:
array([0, 1, 2, 3, 4]) - x(x)int64m0, 1, 2, 3, 4
Values:
array([0, 1, 2, 3, 4]) - y(y)int64m0, 1, 2, 3
Values:
array([0, 1, 2, 3])
- a(y, x)float64m/s0.0, -0.2, ..., 0.13, 0.69σ = 0.97, 0.86, ..., 0.89, 0.12
Values:
array([[ 0. , -0.20068812, 0.38378623, 0.7453609 , -0.39872267], [ 0. , -0.9979938 , -0.83462256, -0.46203528, -0.12719731], [ 1.09912236, 0.98106168, 0.78164792, 0.75140754, 0.37676899], [ 1.14173982, 0.93263384, 0.91277084, 0.12840151, 0.69048226]])
Variances (σ²):
array([[0.94563151, 0.74306463, 0.63773513, 1.63485672, 1.43614491], [0.04967157, 0.97923347, 0.18494896, 0.80732054, 0.52813774], [0.59771679, 0.94938567, 1.47585437, 0.16319883, 0.60611068], [0.02795953, 0.05507998, 1.21916371, 0.79774224, 0.01535208]]) - b(y, x)float64m/s0.0, -0.2, ..., 0.13, 0.69σ = 0.97, 0.86, ..., 0.89, 0.12
Values:
array([[ 0. , -0.20068812, 0.38378623, 0.7453609 , -0.39872267], [ 0. , -0.9979938 , -0.83462256, -0.46203528, -0.12719731], [ 1.09912236, 0.98106168, 0.78164792, 0.75140754, 0.37676899], [ 1.14173982, 0.93263384, 0.91277084, 0.12840151, 0.69048226]])
Variances (σ²):
array([[0.94563151, 0.74306463, 0.63773513, 1.63485672, 1.43614491], [0.04967157, 0.97923347, 0.18494896, 0.80732054, 0.52813774], [0.59771679, 0.94938567, 1.47585437, 0.16319883, 0.60611068], [0.02795953, 0.05507998, 1.21916371, 0.79774224, 0.01535208]]) - c(y)float64m/s0.38, -0.83, 0.78, 0.91σ = 0.8, 0.43, 1.21, 1.1
- aux()int64m2
Values:
array(2) - x()int64m2
Values:
array(2)
Values:
array([ 0.38378623, -0.83462256, 0.78164792, 0.91277084])
Variances (σ²):
array([0.63773513, 0.18494896, 1.47585437, 1.21916371]) - scalar()float64m/s1.23
Values:
array(1.23)
[13]:
<module 'scipp' from '/usr/share/miniconda/envs/tempenv/lib/python3.7/scipp/__init__.py'>