Formula Defaults
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==Formula Defaults Fields== Formula Defaults affect the Solve's appearance or calculations. ===Maximum Iterations=== The Solve algorithm will abort with error message "Maximum iteration limit exceeded" if it takes more iterations than Maximum Iterations. The default value for Maximum Iterations is 200 which will normally do for for a matrix size of about 40 rows and 40 columns. A value of 400 will usually suffice for a matrix size of 50. If the algorithm keeps exceeding Maximum Iterations, increase it or solve as Opt Den (Optimum Density) with W - WeightLimits and a Rng% (Optimum Density Range Percent) of 0. ===Optimum Density=== Optimum Density specifies whether or not the solution calculations should find the optimum yield for the diet without having to produce the exact batch weight specified for the formula. If there is a least cost diet that meets the formula's requirements but with a yield lower or higher than the batch weight, then that diet will be the solution regardless of its final yield.
Optimum Density allows the solve algorithm to increase (or decrease) yield in order to find the optimum nutrient density, resulting in a lower cost than solving with the formula's batch weight. Nutrient density is an important tool in feeding animals under conditions of heat or stress.
Two fields control the use of Optimum Density: the optimum density code and the range percentage.
The Optimum Density codes are:
- "Y - Yes" to find the optimum yield
- "N - No" to use the fixed batch weight (the default)
- "W - WeightLimits" to find the optimum yield within specific limits
If you specify "W-weight limits" you should also specify a range percentage. This is the range within which the solution may vary from the specified batch weight. For example if the batch weight is 1000 and the range percentage is 10%, then the solution yield may be anywhere from 900 to 1100.
Helpful hint: The two optimum density codes use a different model for solving than the fixed batch weight model. A code of "W-weight limits" and a range percentage of zero specifies the same batch weight as "N - No", but uses the optimum density model in the solve. This can be useful for cases where the solve has difficulties with "N - No". ===Optimum Density Range Percent=== Optimum Density Range Percent specifies the upper and lower limits for the optimum density calculations when Optimum Density is set to "W - WeightLimits".
For example, if the batch weight is 1000, an Optimum Density Range Percent of 5.00 will constrain the solve to find the optimum yield within a range of 950 to 1050. ===Default Batch Weight=== The Default Batch Weight value is used automatically when a formula is first created, but it may always be overridden for a specific formula. A typical value is 1000. ===Weight Unit of Measure=== The Weight Unit of Measure applies to the Batch Weight and the weights of ingredients in the formula solution. Typical values are 'pounds - lb', 'tons', 'metric tons', or 'kilograms - kg'. ===Dry Matter Only=== This field sets the default value for all formulas at or below the current control level. The Dry Matter field is a check box that determines whether the solution nutrients and the Batch Weight are to be considered as 100% dry matter. Solution ingredients will be shown “as is.”
If checked, solution nutrients and Batch Weight are shown as 100% dry matter.
If unchecked (default) solution Nutrients and Batch Weight are shown “as is.” ===Round=== ===Log=== ===Rounding Factor===
