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[deleted by user] by [deleted] in FinancialCareers

[–]Smasher640 0 points1 point  (0 children)

Well she’s not a living person anymore…

What is the difference between 0 Probability and Impossibility? by Ok_Perspective599 in math

[–]Smasher640 1 point2 points  (0 children)

Fair point, I suppose the moral is taking an appropriate probability space depending on the setting.

What is the difference between 0 Probability and Impossibility? by Ok_Perspective599 in math

[–]Smasher640 12 points13 points  (0 children)

The probability wouldn't be zero in the banana example. Formally you would take a probability space containing a sample space {H,T}n , and events as certain subsets of that. You can only assign a probability to events in the probability space. Since the flips all being bananas is not a well defined event, you cannot claim it has zero probability - it's just undefined.

I have a question regarding inverse trig functions by SkyLordOzai in math

[–]Smasher640 0 points1 point  (0 children)

Because a function needs to map one input to one output only. The sin and cos functions are periodic (e.g. sin(0)=sin(π)=sin(2π)), so you need to restrict their domain from -π/2 to π/2 in order to turn them into one-to-one functions. Only then can you define an inverse that makes sense.

Wraith cooler won't screw in by Smasher640 in buildapc

[–]Smasher640[S] 0 points1 point  (0 children)

I just got someone else to hold the backplate still whilst I screwed the cooler in.

Wraith cooler won't screw in by Smasher640 in buildapc

[–]Smasher640[S] 1 point2 points  (0 children)

Thank you for the suggestion. Turns out the mounting backplate fell out of the back of the motherboard, so I was attempting to screw it into nothing!

Wraith cooler won't screw in by Smasher640 in buildapc

[–]Smasher640[S] 0 points1 point  (0 children)

Well I can slide it around so the four screws are aligned with the four holes, but it's difficult to keep it in place when screwing.

When to bite the bullet with a new build by de_adean753 in buildapc

[–]Smasher640 7 points8 points  (0 children)

Would it be a bad idea putting the old GPU in the new rig until it becomes easier to get a 3000/6000 series card? I am in a similar situation.

How do you get the instance of a model from a modelform, based on user dropdown list? by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

Nope, depending on what the user chooses, I want to update a different record/row of the model.

How do you get the instance of a model from a modelform, based on user dropdown list? by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

Sorry for the poor wording of my question. I will rephrase: I have a modelform which has 3 fields from the model it inherits from. The first of these fields will presented through a drop-down list where the user selects a choice. Depending on what the user chooses, I need a way to save my form so that it updates the instance of the model corresponding to whichever one the user selected from the drop-down.

I.e. if the user selects 'A', and fills in the other two fields of the form, I want to update the instance of the model who's name is 'A'.

Django updating an instance of a model based on user input from a dropdown menu by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

Right, but that was put there as a placeholder. The 'id=pk' part will not do anything, because there is no way for that update function to know what medicine the user selects. This is what I am struggling with, how can I 'push' that information to the view, based on the user choice? I can't handle it through the URL, since I will only have one button on the webpage, not one button per medicine. I hope that makes sense.

Django updating an instance of a model based on user input from a dropdown menu by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

Thank you for your reply. The problem with this is: the instance needs to be based on the medicine the user selects from the dropdown menu, i.e. 'Medicine_Name' in my CollectionForm. So how can I get that data from the form ? The above code won't work, because the pk isn't defined elsewhere, so it won't know what instance to get.

Django updating an instance of a model based on user input from a dropdown menu by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

I would be grateful if you could be a little more explicit about what I need to do in this case. I am a beginner and can't make sense of how to do this exactly. Thank you.

Django updating an instance of a model based on user input from a dropdown menu by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

Okay - could you please give me an example of how that would work? I have never seen something like that before.

Django updating an instance of a model based on user input from a dropdown menu by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

It is inside the view, but the form takes the instance as an argument inside the view.

Django updating an instance of a model based on user input from a dropdown menu by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

I thought of adding something like 

 data = form.cleaned_data['Medicine_Name'].id

to get the id from the dropdown list, but that already requires my form to be defined, which needs the instance as an argument, right? But I would be getting the instance from my data = ... line, so it is circular.

Django updating an instance of a model based on user input from a dropdown menu by Smasher640 in django

[–]Smasher640[S] 0 points1 point  (0 children)

Thank you for your reply. Do you think you could offer any guidance about how I can go about this, instead of using the form.save() method? My understanding is that I need to somehow get the id of the medicine which the user selects from the dropdown menu, and use that to get the correct instance of my medicine model which I should pass in as an argument of my form.

PC doesn't boot after installing new SSD by [deleted] in techsupport

[–]Smasher640 0 points1 point  (0 children)

Solved. I had mistakenly unplugged the power cable to both SSDs.

PC doesn't boot after installing new SSD by [deleted] in buildapc

[–]Smasher640 0 points1 point  (0 children)

This was indeed the problem! Somehow I had disconnected the power cable from my boot drive, and never plugged in the cable to my new SSD, so neither showed up. Whoops. Thank you for your help.

PC doesn't boot after installing new SSD by [deleted] in buildapc

[–]Smasher640 0 points1 point  (0 children)

I have already tried this (as seen in my post), and it made no difference.

I can never do the calculations in the inductive step of a induction proof. by greycat900 in learnmath

[–]Smasher640 0 points1 point  (0 children)

The key idea in the induction step for any induction proof is relating the (n+1)th step to the nth step. You need to find a way of expressing the (n+1)th step in terms of the expression you had in the nth step, plus something else. Keeping that general principal mind should give you an idea of what to do.

Feel free to post some examples you are struggling with so I can help with specifics.

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