Svar | A Tiny Modern C Header Brings Unified Interface | Addon library
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A Tiny Modern C++ Header Brings Unified Interface for Different Languages
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QUESTION
I want to use a DisplayActionSheet inside my viewmodel, that gets called via a command that gets called by the press of a button. the problem is i dont have access to DisplayActionSheet (the name DisplayActionSheet doesnt exist in current context). Normally i would have just put it in the page.xaml.cs file but the problem is that i am trying to remove a label everytime a certain action is taken, and the collection of labels is located inside the viewmodel. i hope you understand my question.
...ANSWER
Answered 2022-Mar-06 at 16:39DisplayActionSheet
is a method of Page
. To access it from your VM, you can do this
QUESTION
My problem is that I'd like the color to switch depending on what the value is, either odd, even or just 0. I've search on stackoverflow for some answers but none really helped.. So, if the answer is odd, the color shall be blue. If the answer is even, the color shall be red. If the answer is 0, the color shall be yellow.
Any clues that could help me keep going?
...ANSWER
Answered 2021-Dec-01 at 22:56Just debugged your code a little bit
QUESTION
In my php page I have a row of buttons which each have some values (5 in this example). These values shall be send into a ajax script which do some calculation to values and return the result for each button without reloading the homepage. In this example the result will be
FRANK=5 (button 1)
FRANK=frank (button 2)
FRANK=48 (button 3)
FRANK=Bo (button 4)
FRANK=test (button 5)
When I press the first button I should see result 1 on the button. When I press the next button I should see result 2 on the button.
I only have one result returned on button 1 since all buttons has the same container for the return value. I need more containers for return values and I could add $i to the container: . This will give me different containers to return the result to. But how can I use $i in the javascript. My problem is also that var x in the javascript always will be the value from the first button. Again I could add $i to the id="x": id="x'.$i.'" but still I only have document.getElementById("x").value to read the x value in the javascript.
I hope that somebody help me to finish the code here.
Mainpage:
...ANSWER
Answered 2021-Nov-28 at 14:09You can pass this
inside your function call where this
refer to current button which is clicked .Also , you cannot use same ids
for mutliple elements instead use class
selector . So, change your php code like below:
QUESTION
Im getting this error, Warning: React has detected a change in the order of Hooks called by Thread
.
But i can' see the problem, i'm calling it at the top of my function and well i guess i render it conditionally with this code
...ANSWER
Answered 2021-Jul-26 at 21:47you need to extract your all hook calls from condition statements
here's your fixed code
QUESTION
I need help to extract a comment inside a div that holds many other child divs which have there own strings. I have this code to get all the strings inside the div.
...ANSWER
Answered 2021-May-28 at 12:23Try this
QUESTION
everybody!
I have a trigger to replace text BEFORE INSERT to table, i have a text in which need change one word
...ANSWER
Answered 2021-Apr-10 at 23:24If you need to replace a word in text, then use replace()
:
QUESTION
I had previously asked where the Winery types are indexed. I noticed that in the serialization for the schema for Bool
, which is [4,6]
, the 4 is the version number, and 6 is the index of SBool in SchemaP. I verified the hypothesis using other "primitive" types like Integer (serialization: 16), Double (18), Text (20). Also, [Bool]
will be SVector SBool
, serialized to [4,2,6]
, which makes sense: the 2 is for SVector, the 6 is for SBool.
But SchemaP also contains constructors that I don't intuitively see how are used: SFix, SVar, STag and SLet. What are they, and which type would I need to construct the schema for, to see them used? Why is SLet at the end, but SFix at the beginning?
...ANSWER
Answered 2021-Feb-12 at 10:28SFix
looks like a µ quantifier for a recursive type. The type µx. T is the type T where x refers to the whole type µx. T. For example, a list data List a = Nil | Cons a (List a)
can be represented as L(a) = µr. 1 + a × r, where the recursive occurrence of the type is replaced with the variable r. You could probably see this with a recursive user-defined type like data BinTree a = Leaf | Branch a (BinTree a) (BinTree a)
.
This encoding doesn’t explicitly include a variable name, because the next constructor SVar
specifies that “SVar n
refers to the n
th innermost fixpoint”, where n
is an Int
in the synonym type Schema = SchemaP Int
. This is a De Bruijn index. If you had some nested recursive types like µx. µy. … = SFix (SFix …)
, then the inner variable would be referenced as SVar 0
and the outer one as SVar 1
within the body …
. This “relative” notation means you can freely reorganise terms without worrying about having to rename variables for capture-avoiding substitution.
SLet
is a let
binding, and since it’s specified as SLet !(SchemaP a) !(SchemaP a)
, I presume that SLet e1 e2
is akin to let x = e1 in e2
, where the variable is again implicit. So I suspect this may be a deficiency of the docs, and SVar
can also refer to Let
-bound variables. I don’t know how they use this constructor, but it could be used to make sharing explicit in the schema.
Finally, STag
appears to be a way to attach extra “tag” metadata within the schema, in some way that’s specific to the library.
The ordering of these constructors might be maintained for compatibility with earlier versions, so adding new constructors at the end would avoid disturbing the encoding, and I figure the STag
and SLet
constructors at the end were simply added later.
QUESTION
I have the following plot generated in R. How can I set the different colours for the lines? (scale_color_manual(values = c('green', 'red'))
doesn't work
ANSWER
Answered 2021-Jan-26 at 02:44If you want to customize your plots using ggplot2
you need to perform some manipulation taking your data out from counterfactuals
.
QUESTION
I'm using the svars
package to generate some IRF plots. The plots are rendered using ggplot2
, however I need some help with changing some of the aesthetics.
Is there any way I can change the fill and alpha of the shaded confidence bands, as well as the color of the solid line? I know in ggplot2
you can pass fill
and alpha
arguments to geom_ribbon
(and col
to geom_line
), just unsure of how to do the same within the plot
function of this package's source code.
ANSWER
Answered 2021-Jan-20 at 18:53Your first desired result is easily achieved by resetting the aes_params
after calling plot
. For your second goal. There is probably an approach to manipulate the ggplot
object. Instead my approach below constructs the plot from scratch. Basically I copy and pasted the data wrangling code from vars:::plot.hd
and filtered the prepared dataset for the desired series:
QUESTION
I'm using a sample of this dataset below (data
) to create an SVAR model using the svars
package
ANSWER
Answered 2021-Jan-20 at 18:41If we review the source for the plot
method for objects of class sboot
, we'll see that the labels come from the column names of the data.frame in x$true[[1]]
.
So, it's kind of a hack, but very effective to just change the names:
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