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Counting rows with fread without reading the whole file [duplicate]

由 99封情书 提交于 2019-12-01 13:09:12
问题 This question already has answers here : Is it possible to get the number of rows in a CSV file without opening it? (4 answers) Closed last year . I want to use data.table to process a very big file. It doesn't fit on memory. I've thought on reading the file on chunks using a loop with (increasing properly the skip parameter). fread("myfile.csv", skip=loopindex, nrows=chunksize) processing each of this chunks and appending the resulting output with fwrite. In order to do it properly I need to

Internet Explorer 10, max div size of 1.533.917 px

由 霸气de小男生 提交于 2019-12-01 12:51:49
问题 I need to make a really big div, in order of millions of pixels. Searching I found this thread that proves that IE can manage up to 10.000.000 of px. Determine Maximum Possible DIV Height But in my test IE 10 can't size a div more than 1.533.917 px. This is my test: jsfiddle test The value between brackets is the size that I try to set and the previous value is the computed size of the div calculated with jquery. The question is: Why IE can't size a div more than 1.533.917 px in my test? This

How to get cache size in Android

由 一笑奈何 提交于 2019-12-01 12:50:46
I'm using fedor's lazy loading list implementation in my test application where I can clear the cache with a single button click. How can I get the cache size of the loaded images in the listview and clear the cache programmatically? Here is the code for saving the cached images: public ImageLoader(Context context){ //Make the background thead low priority. This way it will not affect the UI performance. photoLoaderThread.setPriority(Thread.NORM_PRIORITY-1); mAssetManager = context.getAssets(); //Find the dir to save cached images if (android.os.Environment.getExternalStorageState().equals

/proc/[pid]/cmdline file size

由 时光怂恿深爱的人放手 提交于 2019-12-01 12:20:21
问题 i'm trying to get the filesize of the cmdline file in proc/[pid]. For example porc/1/cmdline. The file is not empty, it contains "/sbin/init". But i get file_size = 0. int main(int argc, char **argv) { int file_size; FILE *file_cmd; file_cmd = fopen("/proc/1/cmdline", "r"); if(file_cmd == NULL) { perror("proc/1/cmdline"); exit(1); }else { if(fseek(file_cmd, 0L, SEEK_END)!=0) { perror("proc/1/cmdline"); exit(1); } file_size = ftell(file_cmd); } printf("fs: %d\n",file_size); fclose(file_cmd); }

MATLAB: Comparing 2 arrays with different lengths

由 陌路散爱 提交于 2019-12-01 10:58:35
I have two arrays with different lengths (due to different sampling rates) that I need to compare. I'd like to downsample the larger array to match the smaller one in length, however the factor is not an integer but a decimal. For an example: a = 1 1.375 1.75 2.125 2.5 2.875 3.25 b = 1 2 3 Is there any way to manipulate these arrays to match lengths? That's easy to do with clever use of interp1 . The trick is that the keypoints used for interpolation is an array going from 1 up to as many values as you have in a which we will call N , and the interpolated keypoints would be a linearly

Does the size of a Windows Form include its Border?

由 前提是你 提交于 2019-12-01 10:47:31
When you set the size of a windows form, ie; Form1.Size = new System.Drawing.Size(700, 500); Does this include the border which windows puts around the form? Because I have added images (via pictureBoxes) which are 700x500 to my form, and they have been cut off by the border. Also: When I say the border, I mean the default windows border which you can drag the edges of to resize it, as well as contain the red X, Minimize, and Maximize buttons. That depends, you'll get a different size when you target .NET 4.5 for example. The border is always included but you don't really know how much of the

How to get actual size of mounted SD card in Android?

由 半城伤御伤魂 提交于 2019-12-01 10:40:19
I'm trying to find a way to find the total size and free space of a mounted SD card on a phone, from my research on SOF and on the Android devs site I was able to find the method getExternalStorageDirectory() but according to the Android API this returns a directory that is not necessarily external: "Traditionally this is an SD card, but it may also be implemented as built-in storage in a device that is distinct from the protected internal storage and can be mounted as a filesystem on a computer." So I gather from the way that is worded that the "external storage" directory can actually be

Is there a limit to the size of database I can use in an Android OS app?

由 雨燕双飞 提交于 2019-12-01 10:37:46
问题 I have wanted to build an Android app for a long time now, and I just haven't had time to try to learn how to make it so I have outsourced it to a reputable company in India. My app is a really simple db driven reader app. Initially, the development company said there was no problem with my app idea, they'd have it done in 2 weeks. But then, they got back to me and said that my content is too large for the Android OS, and that it wasn't possible to make. For content, I have the text of a book

How to get cache size in Android

由 浪子不回头ぞ 提交于 2019-12-01 10:36:19
问题 I'm using fedor's lazy loading list implementation in my test application where I can clear the cache with a single button click. How can I get the cache size of the loaded images in the listview and clear the cache programmatically? Here is the code for saving the cached images: public ImageLoader(Context context){ //Make the background thead low priority. This way it will not affect the UI performance. photoLoaderThread.setPriority(Thread.NORM_PRIORITY-1); mAssetManager = context.getAssets(

How big is a sonar database?

由 一世执手 提交于 2019-12-01 10:31:15
问题 It might looks like a dumb question. In fact it's more like a poll: how big is your Sonar database? I need this to estimate the requirements for a virtual machine to host my Sonar instance. Also: how big is your team? how many additional bytes is used in the Sonar database for every new commit? I will appreciate any help. 回答1: I'm assuming that you're referring to Sonar from Codehaus, and not SOund Navigation And Ranging. From the installation page: The Sonar web server requires 500Mo of RAM
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