All Questions

1
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Can you draw rectangles of Riemann sums with Python 3?

I already drew the graph of the equation x ** 2 with Jupyter with the code: from sympy.plotting import plot from sympy.abc import x eq=x**2 plot(eq,(x,-2,2),ylim=(-1,2),line_color="g") that gives us the image: but it is also necess...
asked on 16.10.2016 / 08:07
2
answers

How to load the DropDown in Jqgrid

I have tried different ways to load dropdown from my DB to jqgrid but I really do not get it, the idea is to show the dropwdown and set the selected that I bring it from my DB . Attachment captures: In charge...
asked on 06.07.2018 / 22:21
1
answer

Can you operate with decimals in Bash?

Is there any way to work with decimals in Bash? Do operations, obviously. I've tried with let , but it always throws me an error with the decimal part. Thank you very much.     
asked on 05.09.2018 / 08:50
2
answers

Fade only the background of an HTML element

I want the text not to be lost, only the red background color should be lost. Here my code: $('#confirmacion').fadeIn(9500); $('#confirmacion').fadeOut(9500); #confirmacion{ background-color: red; color: #000; height: 2em;...
asked on 23.01.2017 / 05:56
2
answers

How to put a background image with bootstrap 4 with blur effect?

Hello it turns out that I have the following code that puts an image behind with boostrap 4, but I do not know how to put a blur effect without affecting the content as this code shows: html,body{ height: 100%;...
asked on 17.04.2018 / 20:12
2
answers

Check that the value of a field complies with at least one of 3 conditions

I am doing a program which you need to put the Spanish document (NIF, NIE, CIF) and I need to check that the data entered are correct. The user enters the value in a single input and must match the NIF, or NIE, or CIF format. This is the c...
asked on 12.04.2018 / 16:37
1
answer

why do you give me this error Undefined variable:?

Excuse me I'm new to PHP and I'm only doing tests so I do not know why this error is generated:    Notice: Undefined variable: firstName in   C: \ xampp \ htdocs \ Programming \ PHP \ prueba.php on line 8       Notice: Undefined property: pe...
asked on 06.07.2018 / 06:17
1
answer

Identify null values in Laravel and MySQL

I need to make a query to update a data from the relation of two tables, where if the given date (variable $fecha_actualizar ) is the same for perfiles_evento and to check, update the stage in which it is to 4, I think the query is...
asked on 29.06.2018 / 16:32
3
answers

Replace strings with replace JS

Hello I have the following code in JS that detects me in a block of content if it has any of the following sequences of characters and they have to be replaced by images, the problem is that the replace function does not allow me to replace them...
asked on 28.04.2018 / 20:27
3
answers

Voidable types in Java equivalent to those in C #, possible?

The main purpose of this question is to contribute content to Stack Overflow in Spanish In C # we can convert data types (that do not accept the null value) to be nullable; assigning null to this type of data, produces a syntax error since C...
asked on 04.05.2018 / 02:43