How to make a loop to the if else situation ?

I have a coding as follows:

 if (idxi >=1) && (idxi <=5)
   idx='1';
 elseif (idxi >=6) && (idxi <=10)
   idx='2';
 elseif (idxi >=11) && (idxi <=15)
   idx='3';
 elseif (idxi >=16) && (idxi <=20)
   idx='4';
 elseif (idxi >=21) && (idxi <=25)
   idx='5';

The following coding explained that I had a 25 images in a folder in the directory C. Here I make a conditional if, if idxi obtained has a range of 1-5, it is shown is data from mysql database that has idx = 1, when the idxi gained have 6-10 range, then that is displayed is the data from mysql database that has the idx = 2 and so on. But if I add as many as five images into the folder, it means I have to go back to add an if statement in the coding .. What I want to ask is, if I could make a loop so that I do not need to add a conditional if again if I add a new image?

Answer 1

[Adam]

idx = num2str( ceil( idxi / 5 ) );

works if you will always have 5 images in each group and continue that same logic.

[Alvindra Pratama]

so where I have to put what you tell it?

[Adam]

Put it in place of the code you pasted into the question. I did amend what I first wrote slightly as I forgot to assign the result to idx and have also cast it to a char. Now I have done that it directly replaces the code you posted.

[Alvindra Pratama]

Sorry but the code you have been given not work with me

[Alvindra Pratama]

Sorry for my comment above, your code relly really work for me, thank you so much & i apology for what i have said above