comparison

问题 I have 2 excel files and i wanted to compare the contents and highlight the differences. For example: first file... name|age abc|123 def|456 second file... name|age abc|123 def|456 ghi|789 - this being the differece is there any third party libraries to do this? or what would be the best way to do it? 回答1: Like DaDaDom said Apache POI is what you are looking for. You can download it from this page. Mind that POI project is not fully independent and you may need to download some extra

问题 I'm doing a batch script that has to check if there are some programs installed on the computer. For that, I execute programName --version and I store the output in a variable. The problem is when I try to compare with a regular expression (only to know if this program exists in the machine). I'm trying this code, but does't work >output.tmp node --version <output.tmp (set /p hasNode= ) if "%hasNode%" == "[vV][0-9.]*" (echo Has node) else (echo You have to install node) If I change the

问题 I have searched this site for an answer and found many responses to unsigned/signed comparison but this problem is that only unsigned parameters are compared but still it works funny. The problem with the following code is that the first if -statment does not happen ("hello") where as the second ("world") does. This I have interpreted as the calculation that is done inside the if -statment generates a negative number but the exact same calculation done with the result saved to a variables

问题 I need to compare the contents of two almost similar files and highlight the dissimilar portions in the corresponding pdf file. Am using pdfbox. Please help me atleast with the logic. 回答1: If you prefer a tool with a GUI, you could try this one: diffpdf. It's by Mark Summerfield, and since it's written with Qt, it should be available (or should be buildable) on all platforms where Qt runs on. Here's a screenshot: 回答2: You can do the same thing with a shell script on Linux. The script wraps 3

问题 i am leveraging this project to use jqgrid to filter and sort collections. The one missing feature is that this example is not doing case insensitive search which i need. So if a user types in "Test" i want it to match with "TEST", "TeST", etc . . i have code that looks like this: case WhereOperation.Equal: condition = Expression.Equal(memberAccessToString, filter); lambda = Expression.Lambda(condition, parameter); break; case WhereOperation.NotEqual: condition = Expression.NotEqual

问题 I come from a background in C++, and I know that you cannot accurately compare floats for equality. For C#, I simply assumed the same policy applies to decimal values, or any floating point value in general. Basically, I have two decimal values and if they are NOT equal to each other, I need to perform some action. e.g.: decimal value1, value2; // Assume value1 and value2 are set somewhere to valid values. if( value1 != value2 ) { // Do something } If this doesn't work as expected, I'm

问题 I'm unclear about when to use PopupWindow vs Dialog. Any insight would be much appreciated. Thanks. 回答1: They both use the addView() method along with various windowManager methods. The two are similar in that regard. Dialogs seem to come with more built-in features for interaction, such as handlers and buttons already included in the base class, while PopupWindows come with more built-in methods for positioning them about the screen. I think that each of them can do exactly the same as the

问题 So I'm working on a simple Java app that allows a user to input an image as a query and have the app compare it against a database of images (which is basically no more than a directory of different images). I'm basically investigating several image similarity measurement techniques to find out which ones are appropriate for comparing pictures of cars. I've been doing some reading and apart from FFT/SSIM, I've read that the SIFT algorithm can yield very good results. However, as someone with

问题 I'm looking to start using a key/value store for some side projects (mostly as a learning experience), but so many have popped up in the recent past that I've got no idea where to begin. Just listing from memory, I can think of: CouchDB MongoDB Riak Redis Tokyo Cabinet Berkeley DB Cassandra MemcacheDB And I'm sure that there are more out there that have slipped through my search efforts. With all the information out there, it's hard to find solid comparisons between all of the competitors. My

问题 If you were to compare two integers, would the operator have an impact on the time required to perform the comparison? For example, given: if (x < 60) and if (x <= 59) Which would provide the best performance, or would the performance difference be negligible? Are the performance results language-dependent? I often find myself mixing the use of these operators within my code. Any thoughts would be appreciated. 回答1: Even if there was noticeable difference, I think compilers are smart enough to