Hey emjey,
In SimBiology, conditional assignments like the one you described are not directly supported in the same way as typical programming languages. However, you can achieve similar functionality using repeated assignment rules. Since events do not support an `else` clause directly, you will need to set up your model in a way that effectively mimics the conditional logic.
You can achieve this using repeated assignment rules with logical conditions. SimBiology allows you to define rules that continuously update the value of a parameter based on other parameters or species in the model.
You can follow below steps to achieve similar functionality
1. Define Parameters:
- Define the parameters 'a', 'b', 'c', and 'param1' in your model.
2. Create a Rule:
- Add a repeated assignment rule to your model that uses logical conditions.
Example:
Suppose you have parameters 'a', 'b', 'c', and 'param1'. You can define a repeated assignment rule for 'param1' using logical conditions as follows:
% Create a SimBiology model
model = sbiomodel('conditionalAssignmentModel');
% Add parameters
a = addparameter(model, 'a', 1);
b = addparameter(model, 'b', 2);
c = addparameter(model, 'c', 3);
param1 = addparameter(model, 'param1', 0);
% Add a repeated assignment rule
% The rule will use logical conditions to mimic the if-else structure
addrule(model, 'param1 = (a > 0) * (a + b) + (a <= 0) * (a + c)', 'repeatedAssignment');
% Simulate the model (optional)
cs = getconfigset(model);
cs.StopTime = 10;
simData = sbiosimulate(model);
% Plot the results (optional)
sbioplot(simData);
Below is the explanation for above
The rule `param1 = (a > 0) * (a + b) + (a <= 0) * (a + c)` works as follows:
- `(a > 0)` evaluates to `1` if `a` is greater than `0`, and `0` otherwise.
- `(a <= 0)` evaluates to `1` if `a` is less than or equal to `0`, and `0` otherwise.
- When `a > 0`, `(a > 0) * (a + b)` will be `a + b` and `(a <= 0) * (a + c)` will be `0`.
- When `a <= 0`, `(a > 0) * (a + b)` will be `0` and `(a <= 0) * (a + c)` will be `a + c`.
Thus, `param1` will be assigned the value of `a + b` if `a > 0`, and `a + c` if `a <= 0`.
Hope it helps!
