I just do not believe that anyone ever chose a number base for any civilisation. Perhaps I've set up my own argument a little, but the phrase "choosing 60 as a base" which I just used is highly significant. I feel that all of these reasons are really not worth considering seriously. Notice this argument almost contradicts itself since it assumes 10 as the basic unit for division! Now there are sixty of these basic units in a circle so again we have the proposed reason for choosing 60 as a base. Now an angle of an equilateral triangle is 60° so if this were divided into 10, an angle of 6° would become the basic angular unit. For example one theory is that an equilateral triangle was considered the fundamental geometrical building block by the Sumerians. Another hypothesis concerns the fact that the sun moves through its diameter 720 times during a day and, with 12 Sumerian hours in a day, one can come up with 60. Again the idea is not that convincing since the Sumerians certainly knew that the year was longer than 360 days. That the year was thought to have 360 days was suggested as a reason for the number base of 60 by the historian of mathematics Moritz Cantor. The suggestion that 60 is the product of the number of months in the year (moons per year ) with the number of planets (Mercury, Venus, Mars, Jupiter, Saturn ) again seems far fetched as a reason for base 60. Several theories have been based on astronomical events. However although Neugebauer may be correct, the counter argument would be that the system of weights and measures was a consequence of the number system rather than visa versa. For example the decimal 12345 representsġ × 6 0 3 57 × 6 0 2 46 × 60 40 1 \times 60^\normalsize 3 2 as basic fractions. Now given a positional system one needs a convention concerning which end of the number represents the units. Here are the 59 symbols built from these two symbols This is because the 59 numbers, which go into one of the places of the system, were built from a 'unit' symbol and a 'ten' symbol. Now although the Babylonian system was a positional base 60 system, it had some vestiges of a base 10 system within it. However, rather than have to learn 10 symbols as we do to use our decimal numbers, the Babylonians only had to learn two symbols to produce their base 60 positional system. Now of course this comment is based on knowledge of our own decimal system which is a positional system with nine special symbols and a zero symbol to denote an empty place. Often when told that the Babylonian number system was base 60 people's first reaction is: what a lot of special number symbols they must have had to learn. Some would argue that it was their biggest achievement in mathematics. Yet neither the Sumerian nor the Akkadian system was a positional system and this advance by the Babylonians was undoubtedly their greatest achievement in terms of developing the number system. From the number systems of these earlier peoples came the base of 60, that is the sexagesimal system. Certainly in terms of their number system the Babylonians inherited ideas from the Sumerians and from the Akkadians. We give a little historical background to these events in our article Babylonian mathematics. The Babylonian civilisation in Mesopotamia replaced the Sumerian civilisation and the Akkadian civilisation.
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At #security, change it to: security: authorization: enabled Authentication credentials are created by the application as instances of. Run: sudo vim /etc/nfĪdd your server IP in the #network interface, as below: # network interfaces net: port: 27017 bindIp: 127.0.0.1,your_digitalOcean_droplet_ip_here Ensure that the MongoDB version is supported by the Robo 3T you are using. MongoDB, by default, doesn’t allow remote connections. Create a DB and a userĬreate a user and give them readWrite access to your DB. #Using robo 3t installInstall MongoDB in your serverįinish the MongoDB installation by following the official documentation. With Robo 3T, users can auto-complete queries in the MongoDB shell, use drag and drop to build queries, transform a collections schema, schedule tasks, use. I did this some years ago but that time, I was using one-click install by DigitalOcean, and this time I have to do it from scratch in an existing server. Once the development of my webapp is done, it’s time to set up a real MongoDB in a real server. I’ve written about it before here.I use mLab as a development server, so the setup is easy and fast for me to start development straight away. Robo 3T connection (optional) It is always good to have a database client command-line or otherwise to quickly debug what is going on from the database end. To test that all of this is worked properly, I headed over to Postman. #Using robo 3t codeI then saved the model with callback functions to either send back the successfully saved pet or some error handling, sending back a 400 status code and the specifics of the error. Inside the body of this function, I said the body of the POST request will be a new Pet, according to the specifications I made in my Mongoose Pet model. We can also use other find methods to retrieve specific documents as per our requirement. Using the Find method, we can fetch specific documents as well as the particular fields that we need. Next, I established my RESTful services, setting up a “/pets” endpoint. Figure 8: In Robo 3T Conclusion Find method is used to fetch a document from the MongoDB collection. I added a console.log to let me know I successfully connected and to which port. This technology manipulates, queries, and stores data in MongoDB Enterprise. Next, I told the app to receive JSON input and to receive its information from the particular port established. Robo 3T embeds the same JavaScript engine that powers MongoDBs Mongo shell. I also required the file that connects to the MongoDB server. The “app” variable activates express as a function, and “port” specifies the port from which the app runs - in this case port 3000. I must first require Express, as well as the model I just created. Lastly, I exported the Pet model, so it can be used elsewhere in the app.Īfter I created my Pet model, I created an index.js file, from which I run the app itself. It also helps “sanitize,” meaning it ensures all input is tailored to a certain aesthetic, for example, everything in lowercase or - as shown above - all extra white space is trimmed from the input for decluttering purposes. It has a ton of capabilities for verifying email, passwords, postal codes, and hex codes, among many other potentially validated items. I also included the NPM package validator. This means I throw an error and a 400 status if one is missing, though this is something done in Express. I indicated the type of values for name and animal - they are strings. What is outlined above are specifications for how I want each individual Pet entry to end up on the MongoDB server. To get started with Mongoose, I installed it as an NPM package then required it in this file. It includes built-in type casting, validation, query building, business logic hooks and more, out of the box. Mongoose provides a straight-forward, schema-based solution to model your application data.
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