MODEL BUILDER: How to use decimal numbers as increment in "for"-loops

Question

Hi,

I have made a workflow in Model Builder (with topo-to-raster interpolation) and i want to iterate this with a "for"-loop beween the values 0 to 1 within 0.1 steps (=11 loops overall). But it is not possible for me to set the incremet (By Value) to 0.1 or any other decimal number. Do anybody have a wokaround solution for this problem?

Many thanks and greetings, Thomas

ThomasFischer · Answer

A way to get what you want in ModelBuilder is to calculate a float value from your index using the Calculate Value tool.

[ATTACH=CONFIG]22467[/ATTACH]

Another approach could be to try Iterate Multi-value instead of For.

Calculate Value has a parameter called Data Type that can cast the output into the data type your tool requires. Often you can just enter %element name% in your tool dialog within ModelBuilder as well.

A similar approach would work with your other parameter.

The way to nest loops in model buider to put one model inside another:

Integrating a model within a model

Hi Curtis,

thanks, it's working well! Greetings, Thomas

curtvprice · Answer

I have made a workflow in Model Builder (with topo-to-raster interpolation) and i want to iterate this with a "for"-loop beween the values 0 to 1 within 0.1 steps (=11 loops overall). But it is not possible for me to set the incremet (By Value) to 0.1 or any other decimal number. Do anybody have a workaround solution for this problem?

A way to get what you want in ModelBuilder is to calculate a float value from your index using the Calculate Value tool.

[ATTACH=CONFIG]22467[/ATTACH]

Another approach could be to try Iterate Multi-value instead of For. I also tried to iterate over the "maximum iteration number" field in the topo-to-raster parameter settings, but it seems to be not possible to connect this with a "for"-loop.

Calculate Value has a parameter called Data Type that can cast the output into the data type your tool requires. Often you can just enter %element name% in your tool dialog within ModelBuilder as well.

A similar approach would work with your other parameter.

The way to nest loops in model buider to put one model inside another:

Integrating a model within a model

float_iterate.png

ThomasFischer · Answer

Darren thanks for Your reply,

multiplying could be a possible solution. As I havent't wrote in my first post: "Unfortunately", I want to iterate over the roughness-penalty parameter in the topo-to-raster interpolation tool which only can be set -reasonable- to decimal numbers between 0 to 0.5 (recommended).

And another problem:
Instead of the "roughness-penalty " I also tried to iterate over the "maximum iteration number" field in the topo-to-raster parameter settings, but it seems to be not possible to connect this with a "for"-loop.

What I want to do is to find best parameter settings with topo-to-raster for my source data, compared to a reference data set. Allover, there are five parameters I want to prove. Actually 168 possible parameter combinations are set by implementing "multiple-value" variables, considering 3 parameters (disket. error fdactor, vertical standard error, profile curvature). It would be useful and time-gaining to iterate this with a fourth parameter: roughness penalty or maximum iteration number. But it seems not possible...

Greetings, Thomas