output for different changing variables

I have 4 variables a,b,c,d. a can vary 1,2 i.e. a=1,2, b=1,2,3, c=1,2,3,4, d=1,2,3,4,5 so by varying each element I want to make output value i.e.

a b c d      output
1 1 1 1        1
1 1 1 2        2
1 1 1 3        3
1 1 1 4        4
1 1 1 5        5

now varying c with 1 value and d with all values i.e.

a b c d      output
1 1 2 1        6
1 1 2 2        7
1 1 2 3        8
1 1 2 4        9
1 1 2 5        10

now change c to 3 and doing above so getting output as 11,12,13,14,15. when c reaches max varying limit then change b i.e.

a b c d      output
1 2 1 1        16
1 2 1 2        17
1 2 1 3        18
1 2 1 4        19
1 2 1 5        20

then

a b c d      output
1 2 2 1        21
1 2 2 2        22
1 2 2 3        23
1 2 2 4        24
1 2 2 5        25

so like this I want to proceed and want output for all conditions of a,b,c,d. so how to do it or any equation to do this in matlab. in above a,b,c,d vary 2,3,4,5 i.e in increasing order but in general case they can vary without increasing order e.g. a,b,c,d can vary 7,4,9,13.

I have inputs and want to know how to get output for particular input. i.e. if inputs a,b,c,d are given below then how to get output as below

a b c d      output
1 1 1 1        1
1 1 1 2        2
1 1 1 3        3
1 1 1 4        4
1 1 1 5        5

or

another way I have attached file then for particular inputs how to fetch particular number to make output. i.e.

    a b c d      output
    1 1 1 1        1
    1 1 1 2        2
    1 1 1 3        3
    1 1 1 4        4
    1 1 1 5        5

Answer 1

[Matt J]

[d,c,b,a]=ndgrid(1:5,1:4,1:3,1:2);

a=a(:); b=b(:); c=c(:); d=d(:);

[Jay Hanuman]

how to do suppose I have input as follows so how to produce output as follows

a b c d      output
1 1 1 1        1
1 1 1 2        2
1 1 1 3        3
1 1 1 4        4
1 1 1 5        5

a b c d      output
1 2 2 1        21
1 2 2 2        22
1 2 2 3        23
1 2 2 4        24
1 2 2 5        25

[Matt J]

output=sub2ind([5 4 3 2] ,d,c,b,a)

[Jay Hanuman]

Thanks works