is-empty Questions
2
Solved
Today I found that some of my stopifnot() tests are failing because the passed arguments evaluate to empty logical vectors.
Here is an example:
stopifnot(iris$nosuchcolumn == 2) # passes without ...
Hypochromia asked 17/5, 2020 at 23:7
5
Solved
What is the best/most efficient way to check if all tuple values? Do I need to iterate over all tuple items and check or is there some even better way?
For example:
t1 = (1, 2, 'abc')
t2 = ('', 2...
2
Solved
I'd like to check if variable is None or numpy.array. I've implemented check_a function to do this.
def check_a(a):
if not a:
print "please initialize a"
a = None
check_a(a)
a = np.array([1,2])...
8
Solved
Hey there I am searching for a function which is printing a dynamic variable as completely as possible to the console in Dart language.
In PHP for instance I would use var_dump() in order to get a...
Momently asked 24/2, 2017 at 13:38
2
Solved
I don't like uninitialized VBA arrays, since it's necessary to check if array is initialized, each time prior using UBound() or For Each to avoid an exception, and there is no native VBA function t...
Giveandtake asked 2/1, 2020 at 18:36
5
Solved
How can I find out if a list is empty without using the not command?
Here is what I tried:
if list3[0] == []:
print("No matches found")
else:
print(list3)
I am very much a beginner so excu...
6
So i have a script like this to make a 2x2 table by javascript
function createtable(){
var tbl = document.getElementById('x');
if (tbl.contains()==false){
tbl.setAttribute('border', '1');
var ...
Benyamin asked 30/10, 2018 at 5:11
9
Solved
I have a data frame where all the variables are of character type. Many of the columns are completely empty, i.e. only the variable headers are there, but no values. Is there any way to subset out ...
Footcloth asked 16/7, 2013 at 9:21
4
Solved
I am reading through the "Starting Out" chapter of Learn You a Haskell for Great Good!. It says:
null checks if a list is empty. If it is, it returns True, otherwise it returns False. Use this f...
Rima asked 14/7, 2019 at 16:36
4
I have an object and within it I want to check if some properties are set to False, like:
If (Not objresult.EOF) Then
'Some code
End if
But sometimes, objresult.EOF is Empty; how can I check for...
4
Solved
Is there some other way, except Stack<T>.Count() == 0, to check if a Stack<T> is empty?
Coming from C++/Java background where "stack" classes generally have some sort of dedicated "is ...
1
Solved
I am calling web API and receiving the Profile model as a response. When I am using the below code then it is throwing me an error:
try{
if(profile.message.isEmpty){
Navigator.of(context).pushNam...
8
Solved
Is there a JavaScript equivalent to .NET's String.IsNullOrWhitespace so that I can check if a textbox on the client-side has any visible text in it?
I'd rather do this on the client-side first tha...
Imperfective asked 5/4, 2011 at 22:41
1
I am testing the case if my object was empty, so intentionally I made a query that has no match in the database, which should evaluate my else if statement however I don't get any response in the c...
2
Solved
I know it's weird, but this is what I have.
I'm writing a unit test to check my logic for an Android application. During the test execution, I see that it fails on that line:
if (!TextUtils.isE...
4
Solved
I want to check if the app parameter exists in the URL, but has no value.
Example:
my_url.php?app
I tried isset() and empty(), but don’t work. I’ve seen it done before and I forgot how.
4
Solved
I know we can implement PHP's countable interface to determine how the function count() works as well as the Iterator interface for using an object like an array.
Is it possible to implement some ...
2
Solved
I want to check whether a DataFrame is empty :
BTC_ewma_24 ETH_ewma_24 DASH_ewma_24
24 4011.235578 334.597119 281.15
25 4011.285662 334.591056 281.15
26 4011.373673 334.603479 281.15
27 4011.4530...
Ordinance asked 21/8, 2017 at 16:46
6
Solved
I've got a problem with an input field in my php form. It looks like:
<input type="number" name="tmax" max="99" min="-99" placeholder="Temperatura max.">
I want to check whether the field...
1
Solved
Consider code like the following:
<p>&nbsp;</p><!-- comment -->
<span></span><br />
<div><span class="foo"></span></div>
which on ...
Cassondra asked 21/6, 2017 at 12:21
1
Solved
How can I create an empty dataframe in python such that the test df.empty results True?
I tried this:
df = pd.DataFrame(np.empty((1, 1)))
and df.empty results in False.
3
Solved
I have certain scenarios (e.g. a custom class to hold Sql parameters) in which a variable may or may not be required. Traditionally I have always defined these being of type Guid? and used myGuid.H...
Rocher asked 18/7, 2013 at 12:19
5
I'm using DataList to show records on Client Site of my web page. I need to show a message when my DataList is empty. Is there a property of Datalist? How to show that message?
1
Solved
I read that using seq_along() allows to handle the empty case much better, but this concept is not so clear in my mind.
For example, I have this data frame:
df
a b c d
1 1.2767671 0.133558438 1...
1
Solved
I still have trouble with checking if an array is empty or not in laravel.
This is my view:
@foreach($restaurantmenue as $daily)
@if(empty($daily->articles))
no article
@else
@foreach($da...
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