How do i create a loop for this expression?

Taking the number of iterations to be 5

By using i=1:5

How do i use a loop "for" command to express this?

    1 x 8 + 1 
    12 x 8 + 2 
    123 x 8 + 3
    1234 x 8 + 4 
    12345 x 8 + 5

[Jan]

Is this a homework assignment? Do you think you can deliver the soultion without cheating, if it has been posted here? What will you teacher think, when she reads her question here?

Please post what you have tried so far and explain which problems occurred.

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[Imogen Loveday]

pseudocode:

a = 0; for i = 1:5: a = 10a + i; f = 8a + i; print f;

Answer 1

[Jan]

There is an elegant way without using strings: In the first iteratation the multiplicator is 1. In the 2nd iteration it is 10*1 + 2. In the 3rd it is 10*(10*1 + 2) + 3. This can be exploited by using a temporary variable and modify it in each iteration.

Answer 2

[Wayne King]

One way:

   kk = '';
   for ii = 1:5
     kk = [kk num2str(ii)];
     out = str2num(kk)*8+ii
   end

Of course if you want to store the output in an array

 kk = '';
   for ii = 1:5
     kk = [kk num2str(ii)];
     out(ii) = str2num(kk)*8+ii;
   end

Now out is a 1x5 vector with the output values

Answer 3

[Azzi Abdelmalek]

s='12345'
for k=1:length(s)
  res(k)=str2num(s(1:k))*8+k
end

or without a loop

s='12345'
out=arrayfun(@(x) 8*str2num(s(1:x))+x,1:5)

Answer 4

[Maneet Kaur Bagga]

Hi Burners,

As per my understanding you want to use for loop for 5 iterations and display the result of the expression.

You can use a variable i with initial value 1 and a variable num with initial value 0

At every iteration the value of num will be (num*10 + i) and result will be (num*8 + i) and then you can print the result. You can refer the below code. Hope it helps.

num=0

num = 0

for(i=1:5)
    num = num*10 + i
    result = (num)*8 + i
end

num = 1

result = 9

num = 12

result = 98

num = 123

result = 987

num = 1234

result = 9876

num = 12345

result = 98765

Answer 5

[Nipun]

Hi Burners,

Hope this works for you!

str = "0";

for i = 1:5
    str = string(str2double(str)*10+(i));
    ans = (str2double(str))*8+i
end