Hello, I've been tinkering with MIT App inventor and it was a lot of fun. But of course I've some misunderstanding about some usage of the blocks. Especially when I am doing list involving indexes. As for example, I have a list of number {1,0,1,1} and as suppose its indexes are (in order) {1,2,3,4}. If I were to multiply each number in the list with its index, it should be like this: (1x1)+(0x2)+(1x3)+(1x4) right? But my program did it like this: (1x1)+(0x2)+(1x1)+(1x1). I might have some trouble figuring out this. Does anyone can help me on this.
Yes i think now i understand you
Here is how it should be:
this one if you gave it (1 0 1 1 ) and ( 1 2 3 4 ) the output will be 8
And if you want to get how the code make it as string (for debugging):
It will return (11)+(02)+(13)+(14)
Is this what you want?
Yes.But can I know what is in the global list 1 and 2.I'm a bit confussed.
List one will be something like:
List 2 will be:
Actually i want the numbers {1,0,1,1} to be multiply by its index not items in a list.
Okay now i understand you, so no need for list2.You can try this one:
As far as i understand from your question you want something like(from your post)
(1X1)+(0X2)+(1X3)+(1X4)=8
And that's the output here:
But if there are same items,the index will be the same as the 1st.For example, {1,1,0}. First1 =1,second1=1...
Nope,My method won't do that.Becuase i don't use index in list method.I use the number variable directly.Just try it!
I already try it.However, somehow the result is different.Just like this:
I do get "72" when entered "2351" but when I entered "1011" the answer was wrong.I supposed to get "26",but instead i get "6".I've check why it happened.This is because the 2nd and the 3rd "1" index followed the 1st "1". (1×2^1)+(0×2^2)+(1×2^1)+(1×2^1)=6.I hope you can help me.TQ
Please export your project and post it here.
You lost your place counting from 1 to 4.
It is supposed to be
(1×2^1)+(0×2^2)+(1×2^3)+(1×2^4)=
2 + 0 + 8 + 16 = 26
Yes, it is supposed to be like that.But, it didn't.
You used the wrong for each block type.
AI2 does not do a good job of offering the for each number block up from the palette.
Here are corrected blocks, draggable
and proof it works.
Thank you.I will change the block and try it.
Thanks! I already get the answer .Sorry for causing some troubles.
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