Overleaf log base 2

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overleaf log base 2

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The dark mode beta is finally here. Change your preferences any time. Stack Overflow for Teams is a private, secure spot for you and your coworkers to find and share information. C99 has log2 as well as log2f and log2l for float and long double. If you're looking for an integral result, you can just determine the highest bit set in the value and return its position. If you want to make it fast, you could use a lookup table like in Bit Twiddling Hacks integer log2 only.

You have to include math. I needed to have more precision that just the position of the most significant bit, and the microcontroller I was using had no math library. Here is the code:. It doesn't matter whether you choose log or log10 in this case, dividing by the log of the new base does the trick.

Learn more. Asked 9 years, 10 months ago. Active 11 months ago. Viewed k times. Is there any way to write log base 2 function? How to calculate this. Rick Smith 7, 10 10 gold badges 72 72 silver badges 78 78 bronze badges. For eyeball computations, the base 2 logarithm is close to equal to the base 10 logarithm plus the natural logarithm.

Obviously it's better to write a more accurate and faster version in a program. For integers, you could loop on right bitshift, and stop when reached 0. Fast computing of log2 for bit integersWhat's the quickest way to compute log2 of an integer in C?

Active Oldest Votes. Joey k 74 74 gold badges silver badges bronze badges. Adam Crume Adam Crume Andrew Bainbridge 3, 3 3 gold badges 27 27 silver badges 44 44 bronze badges.Remember Me? Originally Posted by shaiko. For example: log2 of 50, is I want, to round it up to 26 instead. How should I modify it? Hello Kevin, Combine how?

overleaf log base 2

Please elaborate Post added at Previous post was at Do you mean like this. Instead of writing your own integer log2 or ceil log2 functions, you can also utilize ieee. Are these standart packages? Kevin, Can you explain please how what I wrote is different then combining the 2 functions? Originally Posted by FvM. I assume, that the log2 problem is related to compile time calculations? Re: [Moved] VHDL log base 2 function I used the term "compile time calculation" to clarify that I'm referring to a case, where the functions are not actually synthesized, just compiled in an early stage of code evaluation by a synthesis tool.

The power of HDL reveals e. The present problem can be still solved by simple integer arithmetics, as you have shown. But once you get used to math. I'm not aware of a VHDL synthesis tool that doesn't support ieee.

Do you know any? Initialise n to 1 instead of 0 in the origional function, and then you always get the correct number of bits. There is no problem using this package for initialisation of constants or generics for any synthesisor Ive ever used, which only extends to ISE, Quartus and synplify 6 years ago.

Its exactly the same as the "log2" function Ive used for several years for sizing arrays. If so, please link me to it.

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Thanks again, SK. Originally Posted by TrickyDicky. I couldn't find an exception. The goal is not a true log2 function, but a way to find the number of bits needed to represent a number. TrickyDicky's function does this correctly. K-J, look at the first posting in the thread. But it's not the correct bit count of an array to represent the numbers There can be no doubt, that log2 1 as well as ceil log2 1 are 0. Why does base 10 log is best for finding gain in decibel? Part and Inventory Search.

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Log Base 2 Calculator

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It only takes a minute to sign up. This is pdfTeX, Version 3. No pages of output. There you have all the test?. Sign up to join this community. The best answers are voted up and rise to the top. Home Questions Tags Users Unanswered. Multiple pdf outputs from one single. Asked 4 months ago. Active 4 months ago. Viewed times. Satyendra Rana Satyendra Rana 53 3 3 bronze badges. The code needs --shell-escape and imho overleaf doesn't allow this.

This is Tom from the Overleaf Support Team. Note that what Ulrike mentions is basically right; we have to apply security restrictions, and --shell-escape conveys some security threats. I'll though double-check what exactly is going on here, and then eventually answer you in more detail. See the answer. Active Oldest Votes. Tom from the Overleaf Support Team writing.

Minimal example to be called main. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Programming tutorials can be a real drag. Featured on Meta. Community and Moderator guidelines for escalating issues via new response….The pgfplots package is a powerful tool, based on tikzdedicated to create scientific graphs.

Pgfplots is a visualization tool to make simpler the inclusion of plots in your documents. Since pgfplot is based on tikz the plot must be inside a tikzpicture environment.

Inside the squared brackets some options can be passed, in this case we set the colour of the plot to red ; the squared brackets are mandatory, if no options are passed leave a blank space between them. Inside the curly brackets you put the function to plot. Is important to remember that this command must end with a semicolon.

To put a second plot next to the first one declare a new tikzpicture environment. Do not insert a new line, but a small blank gap, in this case hskip 10pt will insert a 10pt-wide blank space.

This will add a 3dplot, and the option surf inside squared brackets declares that it's a surface plot. The function to plot must be placed inside curly brackets. Again, don't forget to put a semicolon ; at the end of the command.

overleaf log base 2

This way the code is more readable and is easier to add further options if needed. Open an example of the pgfplots package in Overleaf. To include pgfplots in your document is very easy, add the next line to your preamble and that's it:. Some additional tweaking for this package can be made in the preamble. To change the size of each plot and also guarantee backwards compatibility recommended add the next line:. This changes the size of each pgfplot figure to 10 centimeters, which is huge; you may use different units pt, mm, in.

The compat parameter is for the code to work on the package version 1. Since L a T e X was not initially conceived with plotting capabilities in mind, when there are several pgfplot figures in your document or they are very complex, it takes a considerable amount of time to render them.

To improve the compiling time you can configure the package to export the figures to separate PDF files and then import them into the document, add the code shown below to the preamble:. See this help article for further details on how to set up tikz-externalization in your Overleaf project.

Pgfplots 2D plotting functionalities are vast, you can personalize your plots to look exactly what you want. Nevertheless, the default options usually give very good result, so all you have to do is feed the data and L a T e X will do the rest:. Scientific research often yields data that has to be analysed. The next example shows how to plot data with pgfplots :. Scatter plots are used to represent information by using some kind of marks, these are common, for example, when computing statistical regression.

Lets start with some data, the sample below is to show the structure of the data file we are going to plot see the end of this section for a link to the L a T e X source and the data file :. The parameters passed to the axis and addplot environments can also be used in a data plot, except for scatter. Below the description of the code:. Bar graphs also known as bar charts and bar plots are used to display gathered data, mainly statistical data about a population of some sort.

Bar plots in pgfplots are highly customisable, but here we are going to show an example that 'just works':. The figure starts with the already explained declaration of the tikzpicture and axis environments, but the axis declaration has a number of new parameters:. The coordinates in this kind of plot determine the base point of the bar and its height. The labels on the y-axis will show up to 4 digits. If in the numbers you are working with are greater than pgfplot will use the same notation as in the example.


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