comparison: src/Utils.cpp
src/Utils.cpp
- changeset 163
- 6cccd340ea8c
- parent 135
- e68b27ad8a40
- child 168
- 4bc92122d001
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| 162:19156b8b339f | 163:6cccd340ea8c |
|---|---|
| 41 * Often used formulas divide or multiply with 1.97 to convert between EBC and SRM. | 41 * Often used formulas divide or multiply with 1.97 to convert between EBC and SRM. |
| 42 * Almost all software in the world use this '1.97' formula. | 42 * Almost all software in the world use this '1.97' formula. |
| 43 * The only alternative I have seen is "srm = (ebc * 0.375 + 0.46)", and that has | 43 * The only alternative I have seen is "srm = (ebc * 0.375 + 0.46)", and that has |
| 44 * almost the same results as the formulas used in this program. | 44 * almost the same results as the formulas used in this program. |
| 45 * These formulas come from the Dutch 'brouwhulp' program written by Adrie Otten. | 45 * These formulas come from the Dutch 'brouwhulp' program written by Adrie Otten. |
| 46 * | |
| 47 * Seems that the 'brouwhulp' version use the old EBC conversion (see below) and | |
| 48 * not the new 1.97 formula. Make it selectable? | |
| 46 */ | 49 */ |
| 47 double Utils::ebc_to_srm(double ebc) | 50 double Utils::ebc_to_srm(double ebc) |
| 48 { | 51 { |
| 49 double srm = -0.00000000000132303 * pow(ebc, 4) - 0.00000000291515 * pow(ebc, 3) + 0.00000818515 * pow(ebc, 2) + 0.372038 * ebc + 0.596351; | 52 double srm = -0.00000000000132303 * pow(ebc, 4) - 0.00000000291515 * pow(ebc, 3) + 0.00000818515 * pow(ebc, 2) + 0.372038 * ebc + 0.596351; |
| 50 if (ebc < 0 || srm < 0) | 53 if (ebc < 0 || srm < 0) |
