I want to define three equations for three-time steps.

For the first hour, I can write the following:

p(s,h) $(ord(h) eq 1)..

The last hour will be the following:

p(s,h) $(ord(h) eq card(h))..

I am trying to write equations for the hours in between something like this but can't get the syntax right.

p(s,h) $(ord(h) gt 1 & ord(h) lt card(h))..

I would appreciate any help on this.

## Summing over specific range Topic is solved

### Re: Summing over specific range

Hi

Yould define a parameter as follows:
Cheers

Renger

Yould define a parameter as follows:

Code: Select all

```
alias(h,ah);
parameter hnr(h) Hour ord;
hnr(h) = ord(h);
p(s,h,ah)$(ord(h) eq hnr(h))..
```

Renger

____________________________________

Enjoy modeling even more: Read my blog on modeling at The lazy economist

Enjoy modeling even more: Read my blog on modeling at The lazy economist

### Re: Summing over specific range

Suppose that you are hired as a decision maker for a charity organization called "Help!". This year the

organisation is planning to distribute support packages including basic needs (bottles of water, bread, canned

food etc.) to people in need in their neighbourhood. Some volunteers collected data from around and found

that there are 24 houses which are suitable for this support and gave you the coordinates for those houses.

Houses 1 2 3 4 5 6 7 8 9 10 11 12

x 6 14 14 4 3 10 20 7 12 5 16 6

y 19 7 4 6 13 12 8 17 12 11 19 6

Houses 13 14 15 16 17 18 19 20 21 22 23 24

x 11 14 18 20 11 3 3 6 17 6 17 5

y 16 16 8 12 2 2 11 16 19 3 12 10

Table 1: Coordinates of the houses.

According to the given information try to make decisions for the following problems

Could you help me please have a healtyh days

organisation is planning to distribute support packages including basic needs (bottles of water, bread, canned

food etc.) to people in need in their neighbourhood. Some volunteers collected data from around and found

that there are 24 houses which are suitable for this support and gave you the coordinates for those houses.

Houses 1 2 3 4 5 6 7 8 9 10 11 12

x 6 14 14 4 3 10 20 7 12 5 16 6

y 19 7 4 6 13 12 8 17 12 11 19 6

Houses 13 14 15 16 17 18 19 20 21 22 23 24

x 11 14 18 20 11 3 3 6 17 6 17 5

y 16 16 8 12 2 2 11 16 19 3 12 10

Table 1: Coordinates of the houses.

According to the given information try to make decisions for the following problems

Could you help me please have a healtyh days

### Re: Summing over specific range

I tried the proposed way but I think I didn't quite understand the way you proposed to solve this. Let's say,Renger wrote: ↑1 month agoHi

Yould define a parameter as follows:CheersCode: Select all

`alias(h,ah); parameter hnr(h) Hour ord; hnr(h) = ord(h); p(s,h,ah)$(ord(h) eq hnr(h))..`

Renger

Code: Select all

```
set h /1*10/;
p(s,h) $(ord(h) eq 1)..
p(s,h) $(ord(h) eq card(h))..
```

### Re: Summing over specific range

Hi

Sorry, my mistake. Here a solution: you split the equation in three parts and use the conditions on those parts
THis will result in A(s,h) begin 12 in the first hour, 10 in the in-between hours, and 8 in the last hour.

I hope this helps

Cheers

Renger

Sorry, my mistake. Here a solution: you split the equation in three parts and use the conditions on those parts

Code: Select all

```
p(s,h).. A(s,h) =E=
12$(ord(h) = 1 )$(ord(h) eq 1) +
10$(ord(h) > 1 and ord(h) < card(h));
8$(ord(h) = card(h);
```

I hope this helps

Cheers

Renger

____________________________________

Enjoy modeling even more: Read my blog on modeling at The lazy economist

Enjoy modeling even more: Read my blog on modeling at The lazy economist