zero-pad | 易学教程

Zero-pad digits in string

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问题 I need to cast single figures (1 to 9) to (01 to 09). I can think of a way but its big and ugly and cumbersome. I'm sure there must be some concise way. Any Suggestions 回答1: First of all, your description is misleading. Double is a floating point data type. You presumably want to pad your digits with leading zeros in a string. The following code does that: $s = sprintf('%02d', $digit); For more information, refer to the documentation of sprintf. 回答2: There's also str_pad <?php $input = "Alien

Zero-pad digits in string

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C# Padding Amount With Zeros

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问题 I have an amount field which is a decimal in the database. I need to always display this amount with 10 numbers on the left of the decimal and two after. Example: Amount = 245.00 which should display as 0000000245.00 Additionally, the amount could be over 1,000 or 10,000 which should display as: 0000001245.00 and 0000011245.00 How can I format the amount to always have the appropriate number of zeros on the left side of the decimal with a variable amount size? 回答1: You should put 0's in your

Python datetime formatting without zero-padding

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问题 Is there a format for printing Python datetimes that won't use zero-padding on dates and times? Format I'm using now: mydatetime.strftime('%m/%d/%Y %I:%M%p') Result: 02/29/2012 05:03PM Desired: 2/29/2012 5:03PM What format would represent the month as '2' instead of '02', and time as '5:03PM' instead of '05:03PM' 回答1: The formatting options available with datetime.strftime() will all zero-pad. You could of course roll you own formatting function, but the easiest solution in this case might be

Simple and elegant way to zero-pad a value in C# [duplicate]

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问题 This question already has answers here : C# convert int to string with padding zeros? (12 answers) Closed 6 years ago . I have to fix malformed zipcodes. The people who exported the data treated the zipcode as a numeric and as a result New Jersey and Puerto Rico zipcodes, which begin with a leading zero and two leading zeroes respectively, have been truncated. They're supposed to be all five characters (no zip+4 data is involved). I know how to zero-pad brute-force by getting the length and

Interpolation through fourier space padding

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问题 I recently tried to implement on matlab a simple example of interpolation method using zéro padding in the fourier domain. But I am not able to get this work properly, I always have a small frequency shift, barely not visible in fourier space, but thay generates a huge error in time space. As zéro padding in the fourier space seems to be a common (and fast) interpolation method, I assume that there is something I am missing: Here is the matlab code: clc; clear all; close all; Fe = 3250; Te =

Interpolation through fourier space padding

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I recently tried to implement on matlab a simple example of interpolation method using zéro padding in the fourier domain. But I am not able to get this work properly, I always have a small frequency shift, barely not visible in fourier space, but thay generates a huge error in time space. As zéro padding in the fourier space seems to be a common (and fast) interpolation method, I assume that there is something I am missing: Here is the matlab code: clc; clear all; close all; Fe = 3250; Te = 1/Fe; Nech = 100; F1 = 500; F2 = 1000; FMax = 1500; time = [0:Te:(Nech-1)*Te]; timeDiscrete = [1:1:Nech

In PHP, how do I add to a zero-padded numeric string and preserve the zero padding?

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问题 If I have a variable in PHP containing 0001 and I add 1 to it, the result is 2 instead of 0002 . How do I solve this problem? 回答1: $foo = sprintf('%04d', $foo + 1); 回答2: It would probably help you to understand the PHP data types and how they're affected when you do operations to variables of various types. You say you have "a variable in PHP say 0001", but what type is that variable? Probably a string, "0001", since an integer can't have that value (it's just 1). So when you do this: echo (

In PHP, how do I add to a zero-padded numeric string and preserve the zero padding?

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If I have a variable in PHP containing 0001 and I add 1 to it, the result is 2 instead of 0002 . How do I solve this problem? $foo = sprintf('%04d', $foo + 1); dirtside It would probably help you to understand the PHP data types and how they're affected when you do operations to variables of various types. You say you have "a variable in PHP say 0001", but what type is that variable? Probably a string, "0001", since an integer can't have that value (it's just 1). So when you do this: echo ("0001" + 1); ...the + operator says, "Hm, that's a string and an integer. I don't know how to add a

Zero pad numpy array

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What's the more pythonic way to pad an array with zeros at the end? def pad(A, length): ... A = np.array([1,2,3,4,5]) pad(A, 8) # expected : [1,2,3,4,5,0,0,0] In my real use case, in fact I want to pad an array to the closest multiple of 1024. Ex: 1342 => 2048, 3000 => 3072 numpy.pad with constant mode does what you need, where we can pass a tuple as second argument to tell how many zeros to pad on each size, a (2, 3) for instance will pad 2 zeros on the left side and 3 zeros on the right side: Given A as: A = np.array([1,2,3,4,5]) np.pad(A, (2, 3), 'constant') # array([0, 0, 1, 2, 3, 4, 5, 0,