How to add all the previous values of an array till the index value

[niks9792]

Hi, 

I'm a little new to LABVIEW. I'm working on a program in which I will enter a number and the program will take the values corresponding to that from a .csv file. If I enter 7, I need to add a particular column value( let's say 5th column) till that 7th value. The way which I want to add is like I will be using them in a formula and after finding the answer, I need to add that value to the previous value. Please help me with this.

I tried using shift register but I'm not able to change the values inside the for loop on each iteration( for calculating the answer using the formula). The blue line shows the index value. I'm using LABVIEW 2011.

[GerdW]

Hi niks,

I want to add is like I will be using them in a formula and after finding the answer, I need to add that value to the previous value.

Then you should use that previous value in adding to your current "formula" result - instead of adding zero…

Btw. we cannot debug images using LabVIEW. Why don't you attach your VI?

[niks9792]

Hi, 

I know I've to add that. But couldn't figure out how to add the previous value. That's why I added zero there. Have added the VI  along with this. 

[crossrulz]

You tried a shift register, but all you did was put the value into an indicator.  And the code you showed makes me even more confused than your problem description.  Perhaps an example of input data and what you expect for an output would help.

[crossrulz]

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@niks9792 wrote:

But couldn't figure out how to add the previous value. That's why I added zero there. Have added the VI  along with this. 

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You couldn't figure out how to use a simple wire?

[niks9792]

Hi,

     Sorry for the confusing VI. Simply what I want is the total TCO for the number of months which I enter. If it is 48, I need it to calculate the TCO of that particular year using the equation and I need to calculate the TCO till that month(0-12,12-24,24-36) and I've to add that with the final answer. The first year the TCO is calculated normally and in the 2nd year(12-24 months), I need to calculate the TCO of that particular year and then add the previous value. Like that it should go on. I hope you got my question.

[niks9792]

Hi,

    This one I know. But the issue is how to connect the previous value which is found by the equation(finding that part is which is confusing).

[GerdW]

Hi niks,

how to connect the previous value which is found by the equation

As shown in crossrulz' snippet!

(That random()-function is just a replacement for your "equation"-ExpressVI…)

[niks9792]

Hi,

     How to find the answer by using that equation? That is if I enter the 5th index, how to calculate the total until that particular value? 

[RavensFan · Accepted solution]

Array Subset      Sum Array.