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Randor wrote: They were working with the 16 bit Apollo Guidance Computer[^] with no floating point instructions and that was all they needed to get to the moon.
Of course. Contrary to some beliefs, the moon isn't floating, so why would you need floating point. Besides pure integer has no roundoff error.
CQ de W5ALT
Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software
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Throwback Thursday: Hey mister, got the time? | Computerworld reminded me vividly of when I first faced this issue, when it truly mattered, because I needed to resolve conflicting data base updates that were recorded on two machines that ran in different time zones. Fast forward a decade, and I faced another version of the problem, when the time was recorded when DST was in effect, and reported when it was not, and vice versa. Worse yet was when someone started on a course at 2:15 AM CDT, and finished at 1:45 AM CST. How long did he work on it?
Soon afterwards, I converted every time stamp in the data base table to UTC, retaining the original local times for auditing, and changed the reports to use the UTC time stamps. Since then, I have always recorded UTC times in data base records.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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UTC - There can be only one!
- I would love to change the world, but they won’t give me the source code.
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Forogar wrote: UTC - There can be only one!
Indeed; moreover, it's unambiguous.
Forogar wrote: I would love to change the world, but they won’t give me the source code.
So would I. Even if you got it, it's written in the undocumented assembler for an undocumented hyper-hyperthreaded processor that's also undocumented, and it's devoid of comments. Oh, yea, it's also massively multithreaded.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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Quote: it's written in the undocumented assembler The way it works, you would think it was written in VB6!
- I would love to change the world, but they won’t give me the source code.
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David A. Gray wrote: Forogar wrote: I would love to change the world, but they won’t give me the source code.
So would I. Even if you got it, it's written in the undocumented assembler for an undocumented hyper-hyperthreaded processor that's also undocumented, and it's devoid of comments. Oh, yea, it's also massively multithreaded.
Ahem: Off to Be the Wizard by Scott Meyer[^]
"God doesn't play dice" - Albert Einstein
"God not only plays dice, He sometimes throws the dices where they cannot be seen" - Niels Bohr
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That book looks interesting, and hinges on a concept that has been the subject of several of my thought experiments.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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Now, add this to the mix.
http: [^]
I shudder to think of the havoc this will play with critical systems throughout the sunshine state. Hopefully, if they do pass it, they will wait at least a year to implement. (will we need a new rule for dst (or in this case non-dst) adjusted display? (state != 'FL')
"Go forth into the source" - Neal Morse
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I think he's been trying to make that happen for about as long as he's been in Congress. IMO, it needs to go the other way, and Daylight Saving Time needs to join the ranks of extinct species, along with the dodo bird. From my perspective, the only thing that Daylight Saving Time does is add unnecessary complexity to time keeping.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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I think we should eliminate time zones altogether, and just go by UTC.
".45 ACP - because shooting twice is just silly" - JSOP, 2010 ----- You can never have too much ammo - unless you're swimming, or on fire. - JSOP, 2010 ----- When you pry the gun from my cold dead hands, be careful - the barrel will be very hot. - JSOP, 2013
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What is Internet Time?[^]
Bastard Programmer from Hell
If you can't read my code, try converting it here[^]
"If you just follow the bacon Eddy, wherever it leads you, then you won't have to think about politics." -- Some Bell.
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UTC - There can be only one!
I agree, people would quickly get used to whatever time they do things wherever they are.
An 8 O'clock Breakfast in New York would be at 13:00 (We should also switch to universal 24=hour clocks) and so on - but people would get used to it very quickly and wonder why the old, stupid, system ever existed.
- I would love to change the world, but they won’t give me the source code.
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That would be OK with me. Certain groups, e. g., airline pilots and air traffic controllers, already do so, for all practical purposes, as does the US military.
David A. Gray
Delivering Solutions for the Ages, One Problem at a Time
Interpreting the Fundamental Principle of Tabular Reporting
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That means I just swap places with the kids and get out of bed at 6pm !
A Fine is a Tax for doing something wrong
A Tax is a Fine for doing something good.
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I spent way too long yesterday discovering that XPath 1.0 does not support string comparisons for anything but equal as the args are automatically converted to number...not much use when you are trying to filter an xml document with a date attribute!...or any string which doesn't convert to number) The weird thing about this is that this was VB6 code I am migrating...meaning, it works fine with ancient XML libs, but not a modern framework. (currently targeting 4.0) Such is progress! I guess I'm used to going forward, not backward!
They may have fixed/added this in XPath 2.0 which I think is available under .NET 4.6.2 or something. I chose another method not involving XPath once I discovered why no results were being returned. It was the hours spent cursing and swearing, not understanding why something that looks like it should work doesn't. No error, just no results. It was easy to understand why once I knew that the rules had changed.
For clarity, I'm providing a sample xml doc and code:
The sample xml document was taken from MS sample code. I only added the publish_date attribute as this was akin to my actual usage.
<xml version='1.0'?>
<bookstore xmlns="urn:newbooks-schema">
<book genre="novel" style="hardcover" publish_date="1825-04-02">
<title>The Handmaid's Tale</title>
<author>
<first-name>Margaret</first-name>
<last-name>Atwood</last-name>
</author>
<price>19.95</price>
</book>
<book genre="novel" style="other" publish_date="1901-10-29">
<title>The Poisonwood Bible</title>
<author>
<first-name>Barbara</first-name>
<last-name>Kingsolver</last-name>
</author>
<price>11.99</price>
</book>
<book genre="novel" style="paperback" publish_date="1965-06-10">
<title>The Bean Trees</title>
<author>
<first-name>Barbara</first-name>
<last-name>Kingsolver</last-name>
</author>
<price>5.99</price>
</book>
</bookstore>
and now, the code:
Dim xmlDoc As New System.Xml.XmlDocument
Dim xmlNodes As System.Xml.XmlNodeList
Dim root As System.Xml.XmlNode
xmlDoc.Load("..\bookstore.xml")
Dim nsmgr As System.Xml.XmlNamespaceManager = New System.Xml.XmlNamespaceManager(xmlDoc.NameTable)
nsmgr.AddNamespace("bk", "urn:newbooks-schema")
root = xmlDoc.DocumentElement
'this returns 1 node/record
xmlNodes = root.SelectNodes("descendant::bk:book[@publish_date = '1901-10-29']", nsmgr)
Debug.Print(xmlNodes.Count)
'this returns 0 nodes/records
xmlNodes = root.SelectNodes("descendant::bk:book[@publish_date > '1901-01-01']", nsmgr)
Debug.Print(xmlNodes.Count)
"Go forth into the source" - Neal Morse
modified 12-Jul-18 13:48pm.
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Richard Deeming wrote: You must be doing something wrong
Without a doubt...I'm taking a big risk here, exposing my ignorance!
I've edited the OP with a sample for clarity. I really didn't intend to use the forum for QA, but I think maybe I was a little vague on the exact problem. Thanks!
"Go forth into the source" - Neal Morse
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OK, the "less than" and "greater than" operators don't work for strings, as per the specification:
When neither object to be compared is a node-set and the operator is <= , < , > = or > , then the objects are compared by converting both objects to numbers and comparing the numbers according to IEEE 754.
I'd be very surprised if that wasn't also the case with the old MSXML library. But then again, it was written by 90's Microsoft - they weren't the best at sticking to the specifications!
There's no obvious sign of Microsoft implementing XPath 2 or 3 in .NET; there's an open suggestion from 2013[^] which is "under consideration", with no sign of any action.
There's also an MSDN blog post from 2004[^] suggesting they would be working on XQuery instead. Again, no sign of any progress on that front.
It's also worth pointing out that you can't use the less than or greater than operators on strings in .NET code either. Instead, you have to use the CompareTo method.
You can get close by using LINQ to XML, but that obviously requires you to load the entire document into memory:
var doc = XDocument.Parse(@"<?xml version='1.0'?>
<bookstore xmlns=""urn:newbooks-schema"">
<book genre=""novel"" style=""hardcover"" publish_date=""1825-04-02"">
...
</bookstore>");
var nodes = doc.Descendants(doc.Root.Name.Namespace + "book")
.Where(el => ((string)el.Attribute("publish_date")).CompareTo("1901-10-29") >= 0);
var nodes = doc.Descendants(doc.Root.Name.Namespace + "book")
.Where(el => (DateTime)el.Attribute("publish_date") >= new DateTime(1901, 10, 29));
"These people looked deep within my soul and assigned me a number based on the order in which I joined."
- Homer
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Have you ever researched an effective way to copy data to the user's clipboard from your web app?
Well, it has always been a pain (old methods of using some Flash technique or whatever) or basically impossible.
I just stumbled upon this really cool thing which seems to be the new way to do it and I've tested in Chrome, FireFox and Edge and it works in all 3. W00t!
Here's the simple code I added:
$("#passwordText").select();
document.execCommand("copy");
Did you already know about this and not inform me!?!
I been looking for it for long time.
Here are more complete docs on it. Notice that those docs have been updated recently -- I think this recently (last 6 mos) became available. Only about 7 (or 20) years late.
Interact with the clipboard - Mozilla | MDN[^]
Now you can try C'YaPass and it will automatically copy your password to your clipboard so all you'll have to do is paste it at your target.
C'YaPass : Never type a password again[^]
1. Add your sitekey
2. draw your pattern
3. web app copies 64 character (SHA-256 hash) to your clipboard. Use it as your password.
All sitekeys are stored in your localstorage. You can delete and edit them.
It will remember password requirements (length, special chars, uppercase) for site (if you set them).
And now it copies the password to the clipboard for easy paste usage.
That is all.
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M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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on here played with the Outernet? I saw a demo some time back and am wondering if this might be worth my effort to set up.
rEGARDS,
Walt
Obligatoryt linkhttps://outernet.is/
CQ de W5ALT
Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software
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I don't think this is the correct forum for this query. And I would recommend you to ask without the link, it might be considered spam.
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
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Why would this be the wrong forum and why would you consider it to be spam to simply ask a question?
CQ de W5ALT
Walt Fair, Jr., P. E.
Comport Computing
Specializing in Technical Engineering Software
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Read the description of the forum above. That kind of question is better placed on the lounge or in a forum of the programming language used to interact with it, and not in "the Weird an the Wonderful".
The spam can be considered because you are linking to a external paid product. You can ask exactly the same question without the link. If someone has played with it, (what you want to know), they will recongnise the name anyways, so no link needed. If someone didn't know it, the answwer is "no, I didn't play with it", no link needed anyways.
I know you didn't mind it as spam, that's exactly why I told you it as a friendly warning. Other people could have reported you without saying anything.
M.D.V.
If something has a solution... Why do we have to worry about?. If it has no solution... For what reason do we have to worry about?
Help me to understand what I'm saying, and I'll explain it better to you
Rating helpful answers is nice, but saying thanks can be even nicer.
modified 7-Oct-18 6:12am.
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