How to concatenate arrays with different size in list or array?

I have multiple arrays with different size such as m0xn0xk0, m1xn1xk1, m2xn2xk2.... I am looking for a method to concatenate them into a single array A_concate that can be accessed in future based on the index. It likes

A_concate [0]=a_0 # size of m0xn0xk0

A_concate [1]=a_1 # size of m1xn1xk1

...

Do we have any way to do it in python? Thanks all

asked Nov 12 '18 at 15:15

Moon Lee

83112

1

When you say array do you mean numpy arrays? Numpy arrays have to be rectangular so you can only put together blocks in a way that you end up with a multidimensional rectangle.
– Andras Deak
Nov 12 '18 at 15:16

Yes. There are numpy array
– Moon Lee
Nov 12 '18 at 15:20

add a comment |

A_concate [0]=a_0 # size of m0xn0xk0

A_concate [1]=a_1 # size of m1xn1xk1

...

Do we have any way to do it in python? Thanks all

asked Nov 12 '18 at 15:15

Moon Lee

83112

1

When you say array do you mean numpy arrays? Numpy arrays have to be rectangular so you can only put together blocks in a way that you end up with a multidimensional rectangle.
– Andras Deak
Nov 12 '18 at 15:16

Yes. There are numpy array
– Moon Lee
Nov 12 '18 at 15:20

add a comment |

A_concate [0]=a_0 # size of m0xn0xk0

A_concate [1]=a_1 # size of m1xn1xk1

...

Do we have any way to do it in python? Thanks all

asked Nov 12 '18 at 15:15

Moon Lee

83112

A_concate [0]=a_0 # size of m0xn0xk0

A_concate [1]=a_1 # size of m1xn1xk1

...

Do we have any way to do it in python? Thanks all

python arrays python-3.x

asked Nov 12 '18 at 15:15

Moon Lee

83112

asked Nov 12 '18 at 15:15

Moon Lee

83112

asked Nov 12 '18 at 15:15

Moon Lee

83112

asked Nov 12 '18 at 15:15

Moon Lee

83112

asked Nov 12 '18 at 15:15

Moon Lee

83112

1

When you say array do you mean numpy arrays? Numpy arrays have to be rectangular so you can only put together blocks in a way that you end up with a multidimensional rectangle.
– Andras Deak
Nov 12 '18 at 15:16

Yes. There are numpy array
– Moon Lee
Nov 12 '18 at 15:20

add a comment |

1

When you say array do you mean numpy arrays? Numpy arrays have to be rectangular so you can only put together blocks in a way that you end up with a multidimensional rectangle.
– Andras Deak
Nov 12 '18 at 15:16

Yes. There are numpy array
– Moon Lee
Nov 12 '18 at 15:20

When you say array do you mean numpy arrays? Numpy arrays have to be rectangular so you can only put together blocks in a way that you end up with a multidimensional rectangle.
– Andras Deak
Nov 12 '18 at 15:16

Yes. There are numpy array
– Moon Lee
Nov 12 '18 at 15:20

add a comment |

2 Answers
2

active

oldest

votes

It depends on what you want to do with this structure. For instance, if there is some value unique to m0xn0xk0, m1xn1xk1, m2xn2xk2... that you want to index by then you would use a dictionary like this:

A_concate = {}

A_concate[some_key] = m0xn0xk0

A_concate[some_other_key] = m1xn1xk1

and then you could access them using the key values. On the other hand, if you just want all these lists to live on the same object and you're only going to iterate over them, using a list is fine:

def listify(*args):

    return list(args)



A_concate = listify(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

Finally, if you just want all the values of these objects in the same place, then you could just concatenate them into one list:

def flatten(*lists):

    a = 

    for l in lists:

        a.extend(l)

    return a



A_concate = flatten(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

It just depends on what you want to do with it.

answered Nov 12 '18 at 15:22

Woody1193

2,246930

Thanks. It worked.
– Moon Lee
Nov 12 '18 at 15:38

Hi. If I want to concatenate them in loop. How can I modify your code? I have write a script at here but it does not show correct dimension repl.it/repls/LightGrotesqueCodeview
– Moon Lee
Nov 12 '18 at 15:44

Could you look at my issue? It is missing one dims
– Moon Lee
Nov 12 '18 at 15:59

Of course it is. extend unpacks your list and adds each element to the list you're extending
– Woody1193
Nov 12 '18 at 16:08

1

@MoonLee Sorry about that, I've been doing a lot of C# lately so I got turned around. Use append instead :)
– Woody1193
Nov 12 '18 at 16:32

|
show 3 more comments

If that is all you want to do then why not just put them in a list?

You could use

A_concate = [a_0, a_1, a_2,..., a_n]

If you really want to use an array you could use

import numpy as np

A_concate = np.array([a_0, a_1, a_2,..., a_n])

The above will give you an array of objects. Where each entry is an array. You won't have the full functionality to slice across the internal arrays but it depends on what you want to do

Here is a minimal example of the above

import numpy as np

a_0 = np.arange(9)

a_1 = np.arange(10)

a_2 = np.arange(16)

A_concate = np.array([a_0, a_1, a_2])

EDIT

Add another example to show it works more generally than for 1D arrays

import numpy as np

a_0 = np.random.normal(0,1,size=(3,4,5,))

a_1 = np.random.normal(0,1,size=(4,5,6,))

a_2 = np.random.normal(0,1,size=(35,19,97,))

a_3 = np.random.normal(0,1,size=(2,6,14,22,89))

A_concate = np.array([a_0, a_1, a_2, a_3])

edited Nov 13 '18 at 19:37

answered Nov 12 '18 at 15:20

James Fulton

1765

Sorry. there arrays have different size. Could you show the example with size of 3x4x5 for a_0, 4x5x6 for a_1...
– Moon Lee
Nov 12 '18 at 15:33

Yeh, it will work just the same with your arrays. For example here is one where I concatenate 3 random arrays with shapes 3x4x5, 4x5x6 and 35x19x97. EDIT. I can't get it to display nice in the comments here so I will add it to the answer above.
– James Fulton
Nov 13 '18 at 19:33

add a comment |

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2 Answers
2

active

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2 Answers
2

active

oldest

votes

A_concate = {}

A_concate[some_key] = m0xn0xk0

A_concate[some_other_key] = m1xn1xk1

and then you could access them using the key values. On the other hand, if you just want all these lists to live on the same object and you're only going to iterate over them, using a list is fine:

def listify(*args):

    return list(args)



A_concate = listify(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

Finally, if you just want all the values of these objects in the same place, then you could just concatenate them into one list:

def flatten(*lists):

    a = 

    for l in lists:

        a.extend(l)

    return a



A_concate = flatten(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

It just depends on what you want to do with it.

answered Nov 12 '18 at 15:22

Woody1193

2,246930

Thanks. It worked.
– Moon Lee
Nov 12 '18 at 15:38

Hi. If I want to concatenate them in loop. How can I modify your code? I have write a script at here but it does not show correct dimension repl.it/repls/LightGrotesqueCodeview
– Moon Lee
Nov 12 '18 at 15:44

Could you look at my issue? It is missing one dims
– Moon Lee
Nov 12 '18 at 15:59

Of course it is. extend unpacks your list and adds each element to the list you're extending
– Woody1193
Nov 12 '18 at 16:08

1

@MoonLee Sorry about that, I've been doing a lot of C# lately so I got turned around. Use append instead :)
– Woody1193
Nov 12 '18 at 16:32

|
show 3 more comments

A_concate = {}

A_concate[some_key] = m0xn0xk0

A_concate[some_other_key] = m1xn1xk1

and then you could access them using the key values. On the other hand, if you just want all these lists to live on the same object and you're only going to iterate over them, using a list is fine:

def listify(*args):

    return list(args)



A_concate = listify(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

Finally, if you just want all the values of these objects in the same place, then you could just concatenate them into one list:

def flatten(*lists):

    a = 

    for l in lists:

        a.extend(l)

    return a



A_concate = flatten(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

It just depends on what you want to do with it.

answered Nov 12 '18 at 15:22

Woody1193

2,246930

Thanks. It worked.
– Moon Lee
Nov 12 '18 at 15:38

Hi. If I want to concatenate them in loop. How can I modify your code? I have write a script at here but it does not show correct dimension repl.it/repls/LightGrotesqueCodeview
– Moon Lee
Nov 12 '18 at 15:44

Could you look at my issue? It is missing one dims
– Moon Lee
Nov 12 '18 at 15:59

Of course it is. extend unpacks your list and adds each element to the list you're extending
– Woody1193
Nov 12 '18 at 16:08

1

@MoonLee Sorry about that, I've been doing a lot of C# lately so I got turned around. Use append instead :)
– Woody1193
Nov 12 '18 at 16:32

|
show 3 more comments

A_concate = {}

A_concate[some_key] = m0xn0xk0

A_concate[some_other_key] = m1xn1xk1

and then you could access them using the key values. On the other hand, if you just want all these lists to live on the same object and you're only going to iterate over them, using a list is fine:

def listify(*args):

    return list(args)



A_concate = listify(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

Finally, if you just want all the values of these objects in the same place, then you could just concatenate them into one list:

def flatten(*lists):

    a = 

    for l in lists:

        a.extend(l)

    return a



A_concate = flatten(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

It just depends on what you want to do with it.

answered Nov 12 '18 at 15:22

Woody1193

2,246930

A_concate = {}

A_concate[some_key] = m0xn0xk0

A_concate[some_other_key] = m1xn1xk1

and then you could access them using the key values. On the other hand, if you just want all these lists to live on the same object and you're only going to iterate over them, using a list is fine:

def listify(*args):

    return list(args)



A_concate = listify(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

Finally, if you just want all the values of these objects in the same place, then you could just concatenate them into one list:

def flatten(*lists):

    a = 

    for l in lists:

        a.extend(l)

    return a



A_concate = flatten(m0xn0xk0, m1xn1xk1, m2xn2xk2, ...)

It just depends on what you want to do with it.

answered Nov 12 '18 at 15:22

Woody1193

2,246930

answered Nov 12 '18 at 15:22

Woody1193

2,246930

answered Nov 12 '18 at 15:22

Woody1193

2,246930

answered Nov 12 '18 at 15:22

Woody1193

2,246930

Thanks. It worked.
– Moon Lee
Nov 12 '18 at 15:38

Hi. If I want to concatenate them in loop. How can I modify your code? I have write a script at here but it does not show correct dimension repl.it/repls/LightGrotesqueCodeview
– Moon Lee
Nov 12 '18 at 15:44

Could you look at my issue? It is missing one dims
– Moon Lee
Nov 12 '18 at 15:59

Of course it is. extend unpacks your list and adds each element to the list you're extending
– Woody1193
Nov 12 '18 at 16:08

1

@MoonLee Sorry about that, I've been doing a lot of C# lately so I got turned around. Use append instead :)
– Woody1193
Nov 12 '18 at 16:32

|
show 3 more comments

Thanks. It worked.
– Moon Lee
Nov 12 '18 at 15:38

Hi. If I want to concatenate them in loop. How can I modify your code? I have write a script at here but it does not show correct dimension repl.it/repls/LightGrotesqueCodeview
– Moon Lee
Nov 12 '18 at 15:44

Could you look at my issue? It is missing one dims
– Moon Lee
Nov 12 '18 at 15:59

Of course it is. extend unpacks your list and adds each element to the list you're extending
– Woody1193
Nov 12 '18 at 16:08

1

@MoonLee Sorry about that, I've been doing a lot of C# lately so I got turned around. Use append instead :)
– Woody1193
Nov 12 '18 at 16:32

Thanks. It worked.
– Moon Lee
Nov 12 '18 at 15:38

Hi. If I want to concatenate them in loop. How can I modify your code? I have write a script at here but it does not show correct dimension repl.it/repls/LightGrotesqueCodeview
– Moon Lee
Nov 12 '18 at 15:44

Could you look at my issue? It is missing one dims
– Moon Lee
Nov 12 '18 at 15:59

Of course it is. extend unpacks your list and adds each element to the list you're extending
– Woody1193
Nov 12 '18 at 16:08

@MoonLee Sorry about that, I've been doing a lot of C# lately so I got turned around. Use append instead :)
– Woody1193
Nov 12 '18 at 16:32

|
show 3 more comments

If that is all you want to do then why not just put them in a list?

You could use

A_concate = [a_0, a_1, a_2,..., a_n]

If you really want to use an array you could use

import numpy as np

A_concate = np.array([a_0, a_1, a_2,..., a_n])

The above will give you an array of objects. Where each entry is an array. You won't have the full functionality to slice across the internal arrays but it depends on what you want to do

Here is a minimal example of the above

import numpy as np

a_0 = np.arange(9)

a_1 = np.arange(10)

a_2 = np.arange(16)

A_concate = np.array([a_0, a_1, a_2])

EDIT

Add another example to show it works more generally than for 1D arrays

import numpy as np

a_0 = np.random.normal(0,1,size=(3,4,5,))

a_1 = np.random.normal(0,1,size=(4,5,6,))

a_2 = np.random.normal(0,1,size=(35,19,97,))

a_3 = np.random.normal(0,1,size=(2,6,14,22,89))

A_concate = np.array([a_0, a_1, a_2, a_3])

edited Nov 13 '18 at 19:37

answered Nov 12 '18 at 15:20

James Fulton

1765

Sorry. there arrays have different size. Could you show the example with size of 3x4x5 for a_0, 4x5x6 for a_1...
– Moon Lee
Nov 12 '18 at 15:33

Yeh, it will work just the same with your arrays. For example here is one where I concatenate 3 random arrays with shapes 3x4x5, 4x5x6 and 35x19x97. EDIT. I can't get it to display nice in the comments here so I will add it to the answer above.
– James Fulton
Nov 13 '18 at 19:33

add a comment |

If that is all you want to do then why not just put them in a list?

You could use

A_concate = [a_0, a_1, a_2,..., a_n]

If you really want to use an array you could use

import numpy as np

A_concate = np.array([a_0, a_1, a_2,..., a_n])

The above will give you an array of objects. Where each entry is an array. You won't have the full functionality to slice across the internal arrays but it depends on what you want to do

Here is a minimal example of the above

import numpy as np

a_0 = np.arange(9)

a_1 = np.arange(10)

a_2 = np.arange(16)

A_concate = np.array([a_0, a_1, a_2])

EDIT

Add another example to show it works more generally than for 1D arrays

import numpy as np

a_0 = np.random.normal(0,1,size=(3,4,5,))

a_1 = np.random.normal(0,1,size=(4,5,6,))

a_2 = np.random.normal(0,1,size=(35,19,97,))

a_3 = np.random.normal(0,1,size=(2,6,14,22,89))

A_concate = np.array([a_0, a_1, a_2, a_3])

edited Nov 13 '18 at 19:37

answered Nov 12 '18 at 15:20

James Fulton

1765

Sorry. there arrays have different size. Could you show the example with size of 3x4x5 for a_0, 4x5x6 for a_1...
– Moon Lee
Nov 12 '18 at 15:33

Yeh, it will work just the same with your arrays. For example here is one where I concatenate 3 random arrays with shapes 3x4x5, 4x5x6 and 35x19x97. EDIT. I can't get it to display nice in the comments here so I will add it to the answer above.
– James Fulton
Nov 13 '18 at 19:33

add a comment |

If that is all you want to do then why not just put them in a list?

You could use

A_concate = [a_0, a_1, a_2,..., a_n]

If you really want to use an array you could use

import numpy as np

A_concate = np.array([a_0, a_1, a_2,..., a_n])

The above will give you an array of objects. Where each entry is an array. You won't have the full functionality to slice across the internal arrays but it depends on what you want to do

Here is a minimal example of the above

import numpy as np

a_0 = np.arange(9)

a_1 = np.arange(10)

a_2 = np.arange(16)

A_concate = np.array([a_0, a_1, a_2])

EDIT

Add another example to show it works more generally than for 1D arrays

import numpy as np

a_0 = np.random.normal(0,1,size=(3,4,5,))

a_1 = np.random.normal(0,1,size=(4,5,6,))

a_2 = np.random.normal(0,1,size=(35,19,97,))

a_3 = np.random.normal(0,1,size=(2,6,14,22,89))

A_concate = np.array([a_0, a_1, a_2, a_3])

edited Nov 13 '18 at 19:37

answered Nov 12 '18 at 15:20

James Fulton

1765

If that is all you want to do then why not just put them in a list?

You could use

A_concate = [a_0, a_1, a_2,..., a_n]

If you really want to use an array you could use

import numpy as np

A_concate = np.array([a_0, a_1, a_2,..., a_n])

The above will give you an array of objects. Where each entry is an array. You won't have the full functionality to slice across the internal arrays but it depends on what you want to do

Here is a minimal example of the above

import numpy as np

a_0 = np.arange(9)

a_1 = np.arange(10)

a_2 = np.arange(16)

A_concate = np.array([a_0, a_1, a_2])

EDIT

Add another example to show it works more generally than for 1D arrays

import numpy as np

a_0 = np.random.normal(0,1,size=(3,4,5,))

a_1 = np.random.normal(0,1,size=(4,5,6,))

a_2 = np.random.normal(0,1,size=(35,19,97,))

a_3 = np.random.normal(0,1,size=(2,6,14,22,89))

A_concate = np.array([a_0, a_1, a_2, a_3])

edited Nov 13 '18 at 19:37

answered Nov 12 '18 at 15:20

James Fulton

1765

edited Nov 13 '18 at 19:37

answered Nov 12 '18 at 15:20

James Fulton

1765

answered Nov 12 '18 at 15:20

James Fulton

1765

answered Nov 12 '18 at 15:20

James Fulton

1765

Sorry. there arrays have different size. Could you show the example with size of 3x4x5 for a_0, 4x5x6 for a_1...
– Moon Lee
Nov 12 '18 at 15:33

Yeh, it will work just the same with your arrays. For example here is one where I concatenate 3 random arrays with shapes 3x4x5, 4x5x6 and 35x19x97. EDIT. I can't get it to display nice in the comments here so I will add it to the answer above.
– James Fulton
Nov 13 '18 at 19:33

add a comment |

Sorry. there arrays have different size. Could you show the example with size of 3x4x5 for a_0, 4x5x6 for a_1...
– Moon Lee
Nov 12 '18 at 15:33

Yeh, it will work just the same with your arrays. For example here is one where I concatenate 3 random arrays with shapes 3x4x5, 4x5x6 and 35x19x97. EDIT. I can't get it to display nice in the comments here so I will add it to the answer above.
– James Fulton
Nov 13 '18 at 19:33

Sorry. there arrays have different size. Could you show the example with size of 3x4x5 for a_0, 4x5x6 for a_1...
– Moon Lee
Nov 12 '18 at 15:33

Yeh, it will work just the same with your arrays. For example here is one where I concatenate 3 random arrays with shapes 3x4x5, 4x5x6 and 35x19x97. EDIT. I can't get it to display nice in the comments here so I will add it to the answer above.
– James Fulton
Nov 13 '18 at 19:33

add a comment |

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