JawnV6 posted:

Hate conditional logic? Smuggle the decisionmaking through flow control instead!

JawnV6 posted:

Hate conditional logic? Smuggle the decisionmaking through flow control instead!

ShoulderDaemon posted:

LeftistMuslimObama posted:

It involves a bunch of return statements instead. I didn't say no conditional logic, just fewer if statements. I also didn't think about it too hard so I'm probably missing a corner case in there.

GrumpyDoctor posted:

But my Haskell isn't good enough - can this determine the direction of the mid-weighted coin in the given number of experiments? That's part of the original problem. (Obviously it's just one more experiment, so the big-O complexity doesn't change.)

sarehu posted:

I'm real confused about this "thicket" of conditional logic.

code:

int x = unequal_weight(4, 5) ? 4 : unequal_weight(2, 3) * 2;
return x + !unequal_weight(x, (x + 2) % 6);

sarehu posted:

I'm real confused about this "thicket" of conditional logic.

code:

int x = unequal_weight(4, 5) ? 4 : unequal_weight(2, 3) * 2;
return x + !unequal_weight(x, (x + 2) % 6);

GrumpyDoctor posted:

Clear, intuitive, and complete code, shrughes-style.

sarehu posted:

First you pick the pair, of (0,1), (2,3), or (4,5) that has the bad coin, in two comparisons. Then you use one more to see if the even number is the bad one.

How is that bad?

Sex Bumbo posted:

"no I'm not answering this dumb question"
or
"hold on let me google this because that's what I'd do in a real life scenario"

Rockybar posted:

I've just started processing, and I'm trying to write software which will sort the data output from the serial of an Arduino. Currently the arduino's output looks like this:

code:

Compass
43.04
HR
-604.89
Compass
43.12
HR
-700.00
Compass
43.28
.......

and so on. So in my processing I wrote some code to check the string outputs, and then to read the following line (it switches into HR (heart rate mode), and Compass mode). But it doesn't seem to work. The code is supposed to sort the two inputs, and then take a reading from the next line, until it switches back into the other mode.

code:

   if ( myPort.available() > 0) // If data is available,
          {  
                val = myPort.readStringUntil('\n');         // read it and store it in val
          } 

code:

        if (val.equals("Compass"))
          {
            beatmode = false;
            compassMode = true;  
            text("Hello ",180,80);   //test if the compass mode has been activated
          }
          
        else if (val.equals("HR"))
          {
            beatmode = true;
            compassMode = false;
          }
            
        if (compassMode && !val.equals("Compass"))   // compass readings
          {
            ...some code......
          }   
                
        if (beatmode && !val.equals("HR"))
          {
           ....some code....
              
            beatmode = false; 
            }
            
        }

Am I reading these strings incorrectly, or perhaps the serial? When I come to display the data in my GUI both outputs are simply stuck at 0. Many thanks for any help.

edit: I've also checked if any commands are deleting the outputs before they can be drawn in the program, but this doesn't seem to be the case.

edit 2: here's the full code just in case i'm missing crucial information: http://pastebin.com/eiCBPgG2

Volmarias posted:

Any reason you can't just read the additional expected input immediately?

Rockybar posted:

I could but the issue is once I've cleared up my code a bit I don't think it would work, because it will reach a point where they might be 10 Heart rate outputs before a compass one i.e.e [HR, 70, 60, 65, 54, 70, COMPASS, 98, HR, 20, 52...]. And I'd also like to add new modes quite easily. And I'm still not sure why my code isn't working correctly, is it an issue reading the val output?

edit: I really feel it has to be something to do with the if (val.equals("COMPASS")), is it because of the new line?

Volmarias posted:

OK, that wasn't clear because your sample input had each type only emitting a value once. Assuming that you cannot for some reason change the arduino firmware to work that way, since that would likely simplify both the code on the arduino and the java client, you probably do have to do something like what you had.

The documentation for readStringUntil isn't very clear. But, looking at the source, that calls readBytesUntil, whose doc states "Reads from the port into a buffer of bytes up to and including a particular character." That means that you need to compare against "HR\n" and "Compass\n".

When in doubt, use the debugger to see what input you're actually getting.

Rockybar posted:

code:

String compass = new String("COMPASS/n");

TooMuchAbstraction posted:

Dunno if this is just a typo or not, but your backslash is a frontslash here.

Volmarias posted:

Have you considered looking at what input you're getting? Processing's IDE should have a debugger. At worst, put it into your text(...) calls to see what you're getting.

Turkeybone posted:

Not sure if this is the right place, but, here goes (tl;dr I want to run automated reports but have no clue where to begin):

I work in widget sales, and the first part of each morning I have to update our widget progress to the team, via excel spreadsheets that are emailed. The basic process is:

Open Excel template

Open query in <some crappy, proprietary database view>
Copy results to clipboard, paste into an Excel tab.

Repeat for 15-20 queries.

I wrote a python script where I can do this automatically, so I come into work, double click and then go make a coffee or whatever. The database access we get is so lame, the python code is pretty much keystrokes to get to the saved queries in folders, switch to excel, advance tabs, etc; I can't really get to it in any useful way other than having this db viewer program and excel. But the next step I want to take is to be able to just run this at 5am or whatever, but I'm not really sure from where. Ideas are to leave my work laptop at work, always on, and have some timed execution. Or from home and vpn in.. but shouldn't there be some way I can run a version of this crappy db viewer and excel in the cloud, vpn into my work network, and then access the results in the morning?

If someone could point me in the direction of an answer, it would be greatly appreciated -- my specific widget business is not really a tech savvy one, so there's not much support available for the kinds of things I am trying to do here.

gmq posted:

I have been editing some javascript code that's very efficient but hard to understand. Basically it takes a nested json and with recursion it transforms it into a matrix of objects and arrays to make it easier to transform into an html table.

I work mostly in angular and other javascript libraries but this feels lower level, computer scienciesh I guess?

How can I get to the level where that kind of code is natural to me? What should I read?

gmq posted:

I have been editing some javascript code that's very efficient but hard to understand. Basically it takes a nested json and with recursion it transforms it into a matrix of objects and arrays to make it easier to transform into an html table.

I work mostly in angular and other javascript libraries but this feels lower level, computer scienciesh I guess?

How can I get to the level where that kind of code is natural to me? What should I read?

LP0 ON FIRE posted:

mysql/php/encryption advice needed!

LP0 ON FIRE posted:

No I want to do it so I can learn. We're not storing credit cards, and everything is either hashed or has reversible encryption.

Trapick posted:

Are you storing anything people would be angry about being public? Hint: yes you are. Email addresses, passwords, phone numbers, names, none of that do you want leaked and on your head if you get this wrong.

TooMuchAbstraction posted:

Hey, we're talking encryption and security! That's awesome. I want to implement a basic client/server API to allow our client programs to send notifications to the server. The only big trick here is that only authorized clients should be able to use this service, and the details of the information they're sending should be kept private (i.e. not sent in the clear).

TooMuchAbstraction posted:

This seems fairly straightforward, but I'm worried that I'm the guy going "computer security is easy! " while walking off a cliff into oceans full of Screaming Eels. So, uh, sanity check please?