## How to set a variable equal to zero based on a conditional if-then statement?

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I'm writing a Python script (IDLE) to make a nutrient recommendation, with the following formula:

`potassium_recommendation = (73 + (yieldGoal * 0.21) + (soilPotassium * -0.565) + (yieldGoal * soilPotassium * -0.0016))`

The output of this specific equation tells the user how much potassium a user needs to meet a crop yield goal, and will later be used to calculate a specific amount of fertilizer that needs to be applied.

For this example, let's say that yieldGoal = 200, and soilPotassium = 500.

If you start the growing season with a higher soil potassium level than the crop takes from the soil, you don't need to make a nutrient application. You know this is the case if the equation yields a negative number.

I want to build a conditional statement that sets the `potassium_recommendation` variable equal to zero if a negative number is reached. How can I do that?

Here is what I have tried:

```potassium_recommendation = (73 + (200 * 0.21) + (500 * -0.565) + (200 * 500 * -0.0016))

if potassium_recommendation < 0 == True:
potassium_recommendation = 0
else:
potassium_recommendation = potassium_recommendation

print potassium_recommendation
```

When I run this code, it still produces a negative number. How can I make it zero?

Remove '== True' part in if statement

```potassium_recommendation = (73 + (200 * 0.21) + (500 * -0.565) + (200 * 500 * -0.0016))
if potassium_recommendation < 0:
potassium_recommendation = 0

print( potassium_recommendation)

```

Conditional branching: if, '?', If we want to execute more than one statement, we have to wrap our code Sometimes, we need to assign a variable depending on a condition. 1 , if the value is greater than zero,; -1 , if less than zero,; 0 , if equals zero. For some reason I can't remember how to do this - I believe there was a way to set a variable in Python, if a condition was true? What I mean is this: value = 'Test' if 1 == 1 Where it would hopefully set value to 'Test' if the condition (1 == 1) is true. And with that, I was going to test for multiple conditions to set different variables

A more compact approach is to use the math.max(MIN_VALUE, VALUE):

```potassium_recommendation = max(0, 73 + (200 * 0.21) + ...)
```

Creating New Variables Using if-then;if-then-else; and if-then-else , An if-then statement can be used to create a new variable for a selected subset of For each observation in the data set, SAS evaluates the expression following the if. For a person whose age is less than 65, the variable older will equal 0. The IF-THEN function in Excel is a powerful way to add decision making to your spreadsheets. It tests a condition to see if it's true or false and then carries out a specific set of instructions based on the results. For example, inputting an IF-THEN in Excel, you can test if a specific cell is greater than 900. If it is, you can make the

Instead of `potassium_recommendation < 0 == True` you can write `potassium_recommendation < 0`.

The complete code will look like that:

```potassium_recommendation = (73 + (200 * 0.21) + (500 * -0.565) + (200 * 500 * -0.0016))

if potassium_recommendation < 0:
potassium_recommendation = 0

print potassium_recommendation
```

Review: Logic and if Statements (article), This is a review of what we covered in this tutorial on logic and if statements. using if statements and if/else statements combined with conditional expressions. a boolean value, because it's either true or false , depending on what we set x to. equality operator will just read the value of the variable and see if it's equal to� Conditional code flow is the ability to change the way a piece of code behaves based on certain conditions. In such situations you can use if statements. The if statement is also known as a decision making statement, as it makes a decision on the basis of a given condition or expression. The block of code inside the if statement is executed is the condition evaluates to true. However, the code

Three ways to update C# variables based on a true/false , Here we set the value of the shippingCosts variable based on When we replace this if/else statement with the conditional Else there are zero additional costs. So I am duplicating each observation (expand2) and at the same time creating an indicator equal to zero for the original set of observations. Then I can create a variable that combines "X1HPAR1" and "X1HPAR2", i.e., "X1HPAR". This is not the conventional way to do this, I still refer you again to post #6 and reshape long. However, it

Best Way for Conditional Variable Assignment, Nesting example of method 1: Change variable A value to 0, 1, 2 and a negative string, then the value on the right will be assigned to the variable. If the value on the left of the || does not equal to zero, false, null undefined Another cool thing is that you can do multiple assignment based on a conditional: construct conditional SAS logic, including some that may provide advantages over the IF statement. Topics will include the SELECT statement, the IFC and IFN functions, the CHOOSE and WHICH families of functions, as well as

[PDF] Beyond IF THEN ELSE: Techniques for Conditional , most SAS programmers, is the IF…THEN…ELSE statement. This construct the flow of execution based on whether a specified condition is true or false. The first call to IFC tests whether the value of the variable PCTVAL is equal to 100 zero. It's important that conditional logic be designed to accommodate this behavior� Calls that control the flow of analysis are called conditionals.Conditionals determine if a specified condition is met (or not), then direct subsequent analysis or action depending on whether the condition is met or not.