truncate

Truncating the first 100MB of a file in linux

不问归期 提交于 2019-11-27 14:38:34
问题 I am referring to How can you concatenate two huge files with very little spare disk space? I'm in the midst of implementing the following: Allocate a sparse file of the combined size. Copy 100Mb from the end of the second file to the end of the new file. Truncate 100Mb of the end of the second file Loop 2&3 till you finish the second file (With 2. modified to the correct place in the destination file). Do 2&3&4 but with the first file. I would like to know if is there anyone there who are

Truncate float numbers with PHP

眉间皱痕 提交于 2019-11-27 14:25:36
When a float number needs to be truncated to a certain digit after the floating point, it turns out that it is not easy to be done. For example if the truncating has to be done to second digit after the point, the numbers should be 45.8976 => 45.89, 0.0185 => 0.01 ( second digit after the point is not rounded according to the third digit after the point ). Functions like round() , number_format() , sprintf() round the number and print out 45.8976 => 45.90, 0.0185 => 0.02 I have met two solutions and I am wondering if they are good enough and which one is better to be used 1. function

Truncate NSDate (Zero-out time)

China☆狼群 提交于 2019-11-27 11:55:39
I want to generate a new NSDate with 0 hours , 0 minutes , and 0 seconds for time. The source date can be any random NSDate . Is there a way to achieve this? The documentation did not help me with this. Example Have: 2010-10-30 10:14:13 GMT Want: 2010-10-30 00:00:00 GMT Evan Mulawski unsigned int flags = NSCalendarUnitYear | NSCalendarUnitMonth | NSCalendarUnitDay; NSCalendar* calendar = [NSCalendar currentCalendar]; NSDateComponents* components = [calendar components:flags fromDate:date]; NSDate* dateOnly = [calendar dateFromComponents:components]; date is the date you want to remove the time

I want to truncate a text or line with ellipsis using JavaScript [closed]

雨燕双飞 提交于 2019-11-27 11:46:12
I'm looking for a simple script which can truncate a string with ellipsis (...) I want to truncate something like 'this is a very long string' to 'this is a ve...' I don't want to use CSS or PHP. function truncate(input) { if (input.length > 5) return input.substring(0,5) + '...'; else return input; }; or newer style terser JS... const truncate = (input) => input.length > 5 ? `${input.substring(0, 5)}...` : input; KooiInc has a good answer to this. To summarise: String.prototype.trunc = function(n){ return this.substr(0,n-1)+(this.length>n?'…':''); }; Now you can do: var s = 'not very long'; s

Android: Something better than android:ellipsize=“end” to add “…” to truncated long Strings?

做~自己de王妃 提交于 2019-11-27 11:39:33
This property makes "short and very-long-word" to "short and" . But I want to have smth. like "short and very-lon..." Right now I truncate the String in Java code. However, thats based on the number of characters and not the actual length of the link. So, the result isn't very nice. String title; if(model.getOrganization().length() > 19) { title = model.getText().substring(0, 15).trim() + "…"; } else { title = model.getText(); } ((TextView) findViewById(R.id.TextViewTitle)).setText(title); Update Just noticed, this property actually adds "..." in a few cases. But not in all of them:

How do I indicate long text into a smaller fixed column with CSS?

女生的网名这么多〃 提交于 2019-11-27 11:08:07
How do I fit long text into a fixed width column where I have room for only one line of text? The text needs to be cut to a fixed width (lets say to 100px) and I would like to add dots "..." at the end. Something like this for example: Given string: Some really long string that I need to fit in there! Desired output in fixed-width-column should be: Some really long string... You can do this with CSS alone: .box { -o-text-overflow: ellipsis; /* Opera */ text-overflow: ellipsis; /* IE, Safari (WebKit) */ overflow:hidden; /* don't show excess chars */ white-space:nowrap; /* force single line */

Scala Doubles, and Precision

拥有回忆 提交于 2019-11-27 10:03:17
问题 Is there a function that can truncate or round a Double? At one point in my code I would like a number like: 1.23456789 to be rounded to 1.23 回答1: You can use scala.math.BigDecimal: BigDecimal(1.23456789).setScale(2, BigDecimal.RoundingMode.HALF_UP).toDouble There are a number of other rounding modes, which unfortunately aren't very well documented at present (although their Java equivalents are). 回答2: Here's another solution without BigDecimals Truncate: (math floor 1.23456789 * 100) / 100

php password_verify() hash and pass won't match

ぐ巨炮叔叔 提交于 2019-11-27 09:52:19
I store my passwords in my database hashed with password_hash(), and I am trying to verify the passwords on login with password_verify(). For some reason password_verify() keeps returning false. I read the documentation on this function and it said to make sure that the hash used in the function is between single quotes ' ' otherwise it will read the hash like it is three variables because of the $'s, so i tried writing $valid like this '$valid'. But that didn't work. When I echo $valid the output is $2y$10$zzZCN7UlukvY2skb3ELVp.4y3Oc7NJTEsFyqdstqYxT When I echo $check the output is 123, which

When an int is cast to a short and truncated, how is the new value determined?

限于喜欢 提交于 2019-11-27 09:00:44
Can someone clarify what happens when an integer is cast to a short in C? I'm using Raspberry Pi, so I'm aware that an int is 32 bits, and therefore a short must be 16 bits. Let's say I use the following C code for example: int x = 0x1248642; short sx = (short)x; int y = sx; I get that x would be truncated, but can someone explain how exactly? Are shifts used? How exactly is a number truncated from 32 bits to 16 bits? According to the ISO C standard, when you convert an integer to a signed type, and the value is outside the range of the target type, the result is implementation-defined. (Or an

How to efficiently delete rows while NOT using Truncate Table in a 500,000+ rows table

徘徊边缘 提交于 2019-11-27 06:59:31
Let's say we have table Sales with 30 columns and 500,000 rows. I would like to delete 400,000 in the table (those where "toDelete='1'" ). But I have a few constraints : the table is read / written "often" and I would not like a long "delete" to take a long time and lock the table for too long I need to skip the transaction log (like with a TRUNCATE ) but while doing a "DELETE ... WHERE..." (I need to put a condition), but haven't found any way to do this... Any advice would be welcome to transform a DELETE FROM Sales WHERE toDelete='1' to something more partitioned & possibly transaction log