Categories
User Help Web Pro

What is the practical difference between codeigniter form helper and reguler html form?

I was looking for a easy way to make HTML forms. While working with Codeigniter I found that there is a helper library for generating form. But it seems so bulky and there was too many things to write . I think HTML forms are easy to make and maintain. But if that so , […]

Categories
Ask Chemistry

Help with Chemistry for engineers, PLEASE!

Under certain conditions, the well-known fertilizer ammonium nitrate (NH4NO3) explodes according to the following balanced equation: 2NH4NO3(s) → 2N2(g) + 4H2O(g)+ O2(g) Exactly 488 g of ammonium nitrate is placed in a 180.03 L constant-volume container containing dry air at 322.3 kPa and 25 ºC. The container is heated to 470 ºC and an explosive […]

Categories
Ask Chemistry

What is the theoretical yield (in grams) of CO2?

Consider the reaction: NaHCO3(aq) + HCl(aq) → NaCl(aq) + CO2(g) + H2O(l) 0.082 moles of NaHCO3 is reacted with excess HCl.

Categories
Linux Mastering Development

Command works fine but fails when executed remotely over ssh

The below command works fine of remote AiX server when run on the server. ls -ltr /tmp/*.pid | grep "$(date ‘+%b %e’)" Output: -rwx-rwx-rw– …….. Oct 1 /tmp/new.pid echo $? 0 I wish to run the above command using ssh but it fails. See output below: ssh user@10.0.0.9 -C ‘ls -ltr /tmp/*.pid | grep "$(date […]

Categories
Linux Mastering Development

how to retrieve ssh password with working ssh key

I always login a server with a ssh key, so I am not sure what my actual password was anymore. I would need to guess a couple of times. However the server has fail2ban and I don’t want to trigger that. Is there any way to check which of my passwords corresponds to the ssh […]

Categories
Mastering Development

Date Subtraction for Sweep in R

I have a datavectorthat looks like this: And a dataframe with a columns of dates, that looks like this: Where the number of rows in this dataframe is equal to the length of new_first_dates. I want to subtract new_first_dates, from each row of the dataframe. I tried using sweep but it won’t work. Does anyone […]

Categories
Mastering Development

Initializer in a Swift Class

I have come to Swift from other languages. There is a pattern I sometimes use in defining a class in which the initializer calls another function which would be called later to re-initialize. class Test { var thing: String init() { reinit() // ‘self’ used in method call ‘load’ before all stored properties are initialized […]

Categories
Mastering Development

Use external constructor of base class in extended class __init__

Here is the setup: There is an external library that has a class called BaseClass class BaseClass(): def __init__(self, x): self.x = x def base(self): print("base class, x= {}".format(self.x)) There is another external library with a function that constructs BaseClasses def constructor_fn(x): # do some cool things return BaseClass(x) I want to extend BaseClass for […]

Categories
Mastering Development

register allocation — how to utilize and spill the caller saved registers

I have learned that if any of the caller saved registers (rax rdx rcx rsi rdi r8 r9 r10 r11) is used by the callee, then it has to be saved before and restored after a call instruction by the caller. Through the following example, int read(); void print(int i); int main() { int a […]

Categories
Mastering Development

Assign Logged in User to Textbox inside a FormView Control

ASP.Net using C# I am in need of correct syntax. This is critical at this point. I need to assign the Authenticated/Logged in user to a Textbox inside a FormView control (FormView1 to be exact)! I can’t get this any further and I am asking for help. I want to admit upfront that I don’t […]