-
Re: what if analysis
If you can't do a (partial) reload, you would need to move your new field calculations to the frontend, i.e. use an expression or calculated dimension instead. Not sure if this is possible or easy doable in your case, to help you more, you would need to give more information about your data model, the what-if analysis you want to do and the calculations used in the script.
Probably best to post a small demo app that demonstrates your issue here to the forum.
-
what if analysis
I'm not an expert, thus correct me if i'm wrong:
i have some data loaded from an excel file, that are saved into a fieldi have a variable which the user can modify using the slider
i have to dinamically make calculations with those 2 data (for example multiply the values taken from excel and the variable)
if i understand correctly, these calculations can only be done within the script
otherwise i would need something like X variables to contain all the values of the excel file
i am really confused about that
-
what if analysis
I think it should be possible to calculate all is needed in the frontend.
Could you post a small sample (e.g. the excel file), doesn't need to contain your real data, but should demonstrate your issue?
-
-
Re: what if analysis
If you want to calculate something in the frontend, you need to use a chart object where you can use expressions, just a table box will not do the job.
For example create a straight table chart object with dimension name and as expression
= quantitiy * vVariable
This should dynamically re-calculate your values when you move the slider / change the variable.
Hope this helps,
Stefan
-
what if analysis
Ok, i wrote a bad example: my situation is a little more complicated
I have changed the attached file with a new one
As you can see i have 3 variables, and based on the content of the "name" field i load a different value and assign it to the "variable" field
This way i can then use this field to make sum and other aggregations
But i have to do this outside the load script
If i make an expression in the chart table (as your example shows), i cannot use that value outside the chart
-
Re: what if analysis
That's indeed only a little bit more complicated.
You just need to convert your script expression in a front end expression, so I think you can use an expression like
=pick(match(name,'a','b','c'),vVariableA,vVariableB,vVariableC)
to pick the right variable for your name and then just multiple by your quantity or if you want to have an aggregate over all your names:
=sum(aggr(quantity*pick(match(name,'a','b','c'),vVariableA,vVariableB,vVariableC),name))
See also attached,
Stefan
-
what if analysis
Thanks for your time Stefan, and thanks for the hints
But this way it's gonna be too complicated soon
A friend of mine suggests to define some variables to contain the values i need
But even in this case i get into some unexpected errors
I have edited the discussiond and attached a new file
As you can see i create vVariable to contain tha value i need, whit the various "if" in the expression
Then i create vResult, expecting to multiply vVraiable with quantity
But as you can see in th table it only shows some -
Is this an expected behavoir?
How can i make calculations with variables?
-
Re: what if analysis
You are almost there.
Your vVariable including the multiple if() functions is not much different from the pick(match()) combination, by the way.
If you want to use variables, one big point is to know how variables are evaluated (in which context). See
http://www.qlikfix.com/2011/06/08/not-all-variables-are-created-equal/
for quite a good explanation of what I mean.
If you want to evaluate the sum of vVariable*quantity e.g. in a text box, I believe you need advanced aggregation, because you need to evaluate the variable per dimension name.
Please see attached.
Hope this helps,
Stefan
-
what if analysis
I didn't understand the mechanichs of = and $ with variables, but at least i got what i needed =)
Anyway to get the total in the textbox i can just:
=sum($(vResult))Thanks for all your help!
Maik
-
-
-
-
-
-
-
-
-