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Paperclip::Errors::MissingRequiredValidatorError with Rails 4
... Paperclip will also throw "Missing Required Validator Error" in case of PDF file upload. The workaround for that is: First install the "GhostScript" and then add "application/pdf" to content-type.
– HackerKarma
Mar 10 '14 at 15:41
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Finding all cycles in a directed graph
...owing link:
http://www.cs.tufts.edu/comp/150GA/homeworks/hw1/Johnson%2075.PDF
A java implementation can be found in:
http://normalisiert.de/code/java/elementaryCycles.zip
A Mathematica demonstration of Johnson's algorithm can be found here, implementation can be downloaded from the right ("Downl...
Is functional GUI programming possible? [closed]
...he technique and the decisions: conal.net/papers/genuinely-functional-guis.pdf I have been doing purely functional GUI programming in this style for a few months now. I LOVE it, it is such a pleasant relief from the spaghetti hell of imperative UI programming, which seems to be worse in this respe...
What is an intuitive explanation of the Expectation Maximization technique? [closed]
...er guesses:
likelihood_of_red = stats.norm(red_mean_guess, red_std_guess).pdf(both_colours)
likelihood_of_blue = stats.norm(blue_mean_guess, blue_std_guess).pdf(both_colours)
Here, we have simply put each data point into the probability density function for a normal distribution using our current...
Why are C character literals ints instead of chars?
..."high level assembler".
(See 6.3.3 on page 6-25 of http://www.dmv.net/dec/pdf/macro.pdf)
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Managing CSS Explosion
...l 4 my answer has included the advice to download and read Natalie Downe's PDF CSS Systems. (The PDF includes tons of notes not in the slides, so read the PDF!). Take note of her suggestions for organization.
EDIT (2014/02/05) four years later, I'd say:
Use a CSS pre-processor and manage your fil...
Pandoc markdown page break
... to use raw LaTeX \newpage. This works perfectly when outputting LaTeX (or pdf created through LaTeX). However, one will run into problems when targeting different formats like HTML or docx.
A simple solution when targeting other formats is to use a pandoc filter which can transform the internal do...
File Upload ASP.NET MVC 3.0
...GetExtension(Request.Files[0].FileName).ToLower();
if (extension != ".pdf" && extension != ".doc" && extension != ".docx" && extension != ".rtf" && extension != ".txt")
{
ModelState.AddModelError("uploadError", "Supported file extensions: pdf, doc, do...
只有程序员能看懂的笑话 - 轻松一刻 - 清泛网 - 专注C/C++及内核技术
...厌康熙的哪个儿子？ 答：胤?。 因为他是八阿哥。 加强版 程序员最喜欢七阿哥，因为他弟八阿哥。。。
随机函数可以帮你实现家庭和谐： Talk(){:top word(1)=”恩！”; word(2)=”好的！”;word(3)=”然后呢？”;word(4)=”有道理”;i=...
强烈推荐一款非常mini的代码高亮开源软件--prism - 开源 & Github - 清泛网...
...定制化下载，按照需求下载相应的编程语言支持js，开发版或迷你版。更重要的是代码本身非常小巧，js、css各一个文件，使用时引入它们，它会自动将<pre><code class="language-c">...printf("hello, world");...</code></pre>之间的代码进行高亮...