topic Re: How to get a label using a variable? in FlexSim Forum

How to get a label using a variable?

cphilpottX22K5 — Thu, 18 May 2023 22:05:37 GMT

[ FlexSim 23.1.0 ]

I am trying to use a string variable in a reference to a patient label, to check the value of multiple labels inside a loop inside of an Assign Labels object.

When tokens enter this Assign Labels, they have several labels set to 0 or 1 depending on whether they need certain imaging tests.

The new label value should be a 0 if all of several labels are set to 0, or 1 if there are any labels set to 1.

I am currently assigning these labels to the patient (they are "xray", "ct", etc. 0/1 for each) and trying to evaluate them by referencing the list in a table, as pictured below:

/**Custom Code*/
Object current = param(1);
Object patient = current;
treenode activity = param(2);
Token token = param(3);
Variant assignTo = param(4);
string labelName = param(5);
treenode processFlow = ownerobject(activity);

print(patient);


int imgCount = 0; // set count of imaging processes to 0

// check the table of imaging assignment values for imaging names
Table headers = Model.find("Tools/GlobalTables/ptFlowPcts");

print(headers);
print(headers.numCols);

for (int i = 1; i = headers.numCols; i++){ // loop through the number of columns
    string img = headers.getColHeader(i); // get the column name (imaging type) for each loop
    imgCount += patient.img; // try to get the 0 or 1 value of this label
}
if (imgCount = 0){
    return 0; // return 0 (no) only if there are no imaging called for
}
else{
    return 1; // return 1 if one or more imaging is called for
}

The question at hand is: how can i reference a label on a patient using a variable, so that I can check an arbitrary number of labels in a code block? I have tried a few different things:

```
label(patient, img)
```
```
patient.img
```
```
patient."img"
```
```
patient.labels[img].value
```
```
patient.labels[img].evaluate()
```
... and every other combination I could come up with.

Some of them led to a crash, some just threw an exception saying the label didn't exist. I am at the point where I just have to say I don't know how this should work.

---

Ideally I would just have a label that contains an array with a list of imaging randomly assigned based on our client data. And now that I think about it, I should be able to do that with code. But I'd still like to know better how to do what I described above.

Thanks in advance, you are all always so helpful!

Re: How to get a label using a variable?

Matthew_Gillespie — Thu, 18 May 2023 23:01:56 GMT

The correct way to get a label node from a string variable is

patient.labels[img]

Then to get the value off that node you can use .value or .evaluate() if you want it to execute a FlexScript node:

patient.labels[img].value
patient.labels[img].evaluate()

Here's an example model that demonstrates it working

LabelFromString.fsm

Re: How to get a label using a variable?

cphilpottX22K5 — Fri, 19 May 2023 21:23:23 GMT

It turns out that I was getting the label correctly. It only threw an exception when I tried one of the invalid ways to get the label.

The code is crashing in the for loop. For some reason the following bit returns a seemingly infinite number of empty lines:, even when headers.numCols is replaced with a low integer like 5

  for (int i = 1; i = headers.numCols; i++){ // loop through the number of columns
    string img = headers.getColHeader(i); // get the column name (imaging type) for each loop

Re: How to get a label using a variable?

Matthew_Gillespie — Fri, 19 May 2023 21:33:39 GMT

You forgot the less than character in your for loop end condition:

for (int i = 1; i = headers.numCols; i++)

but should be

for (int i = 1; i <= headers.numCols; i++)

Re: How to get a label using a variable?

cphilpottX22K5 — Tue, 06 Jun 2023 20:43:22 GMT

Thanks. I had figured this out and meant to update but looks like I never came back to it.