Python trying to generate all possible combinations of an array

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given two arrays I'm trying to get all the different combinations of the arrays with no repeats of sequences and without using itertools. My problem comes when I try to combine a 2 dimensional array with a 1 dimensional array. given arrays [1,2],[1,3],[1,4],[2,3],[2,4] and [1,2,3,4] I want it to yield [1,2,3],[1,2,4],[1,3,4],[2,3,4]. currently it will produce [1,2,3], [1,2,4] and [1,3,4] but not [2,3,4] and I can't figure out why.

What I have tried:

Python

change_array = [1,2],[1,3],[1,4],[2,3],[2,4]
base_array = [1,2,3,4]
save_array = []

    
def candidate_generation2(change_array, base_array, save_array):
    current_iteration = []
    for x in range(0, len(change_array)):
        d = []
        for y in range(0, len(change_array[0])):
            d.append(change_array[x][y])        
        for z in range(x + 1, len(base_array)):
            e = d.copy()
            tag = 0
            for a in range(0, len(e)):
                if e[a] == base_array[z]:
                    tag = 1
            if tag == 0:
                e.append(base_array[z])
                save_array.append(e)
                current_iteration.append(e)
    chenge_array = current_iteration.copy()

candidate_generation2(change_array, base_array, save_array)    
print(save_array)<pre>

thanks in advance for any help

Posted 21-Oct-22 1:01am

veera ravala

Updated 28-Oct-22 20:23pm

Patrice T

v3

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Richard MacCutchan · Accepted Answer · 2022-10-21T01:21:00

You need to define the rules for changing. At a guess from looking at your desired results you need to check each entry in the first array. Then find all values in base array larger than its largest number. Create the new three element array from that and continue until all have been processed.

Try this:

Python

change_array = [1,2],[1,3],[1,4],[2,3],[2,4]
base_array = [1,2,3,4]
save_array = []
for ca in change_array:     # loop through all entries
    highest = ca[1]         # get the last value in the item
    for bav in base_array:  # check all base values
        if bav > highest:   # if it is higher 
            cp = ca[:2]     # take a copy of the original item
            cp.append(bav)  # append the new highest number
            save_array.append(cp) # save the modified element
print(save_array)