How can I count the zero number in my decsion variable?
Awaiting user inputI want to count how many zeros in hire[], and get num_hire for the numbers of zero, so I tried to use the following code. But bug come out. How can I count them?
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Community Moderator
Dear Tangzhe,
based on the description you provided it is difficult to give specific advice. Could you please share a minimal reproducible example of your problem?
Best regards
Jonasz0 -
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hire[j] is a decision variable for how many workers are hired in j month in a year in my code. and num_hire, I would like to treat it as a label, counting how many times for the company hire worker in a year. For example, if hire[j]=[0,0,0,0,0,1,2,3,4,5,6,7] in a year (j represents the month) (the company hire 1 person in June and 7 people in Dec. etc.) then the variable num_hire should be 7,cause the company hire people 7 times in this year.
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Here is how I define the decision variable Hire[j] Besides, J is the month in a year
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Thanks for these clarifications. In the future please paste the code rather than the screenshot - you can't really copy anything out from a picture...
My understanding is that you would be interested in knowing how many variables were assigned a value of 0 in the optimal solution to your problem. This can be done by checking the parameter x of the respective variable.
In your case, the simplified code (not accounting for integer tolerances) would look something like:
num_hire = 0
for j in J:
if hire[j].X == 0:
num_hire += 1If that's not what you're looking for, we would require a complete description of the model you are trying to implement to give further guidance.
Best regards
Jonasz0 -
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