  C RUBY-ON-RAILS MYSQL ASP.NET DEVELOPMENT RUBY .NET LINUX SQL-SERVER REGEX WINDOWS ALGORITHM ECLIPSE VISUAL-STUDIO STRING SVN PERFORMANCE APACHE-FLEX UNIT-TESTING SECURITY LINQ UNIX MATH EMAIL OOP LANGUAGE-AGNOSTIC VB6 MSBUILD # Determine if a PHP array uses keys or indices ## Determine if a PHP array uses keys or indices Tag : php , By : Waynew Date : January 10 2021, 01:47 PM Boards Message : You Must Login Or Sign Up to Add Your Comments .

## Algorithm to determine indices i..j of array A containing all the elements of another array B

Tag : algorithm , By : Nicholas Hunter
Date : March 29 2020, 07:55 AM
The following is provably optimal up to a logarithmic factor. (I believe the log factor cannot be got rid of, and so it's optimal.)

## Convert an array to hash, where keys are the indices

Tag : ruby , By : itsmegb
Date : March 29 2020, 07:55 AM
this will help I am transforming an array into a hash, where the keys are the indices and values are the elements at that index.
``````arr = ["one", "two", "three", "four", "five"]

x = Hash[(0...arr.size).zip arr]
# => {0=>"one", 1=>"two", 2=>"three", 3=>"four", 4=>"five"}
``````

## Access deep array value in php using an array of keys/indices in php?

Tag : php , By : FuzzyHornet
Date : March 29 2020, 07:55 AM
I hope this helps you . First of all (you have typo array('c' = 'value'), should be array('c' => 'value'),) I tried to use your code:
``````\$object = array ('a' => array ( 'b' => array('c' => 'value'), 'd' => 3));
\$indices = array ('a', 'b', 'c');

echo accessObjectKey(\$object,\$indices);
``````
``````function getByPath(\$arr,\$path) {
if (!isset(\$arr[\$path])) {
return 'There is no '.\$path.' element!';
} elseif(count(\$path)==1) {
return \$arr[\$path];
} elseif(!is_array(\$arr[\$path])) {
return 'Element '.\$path.' is not array! ';
} else {
\$key = array_shift(\$path);
return getByPath(\$arr[\$key],\$path);
}
}

\$object = array ('a' => array ( 'b' => array('c' => 'value'), 'd' => 3));
\$indices = array ('a', 'b', 'c');

echo getByPath(\$object,\$indices);
``````

## How do I use an array of named indices (keys) to set a value in a nested hash?

Tag : ruby , By : yew tree
Date : March 29 2020, 07:55 AM
I think the issue was by ths following , Much simpler approach(in my opinion) is to access elements successively with :[]:
``````keys = [:canada, :ontario, :ottawa]
hash = { canada: { ontario: { ottawa: :me}, manitoba: { winnipeg: nil} }, united_states: { district_of_coloumbia: { washington: nil } } }

# get
p keys.inject(hash) { |h, k| h.public_send(:[], k) }
#=> :me

# set
last = keys[0..-2].inject(hash) { |h, k| h.public_send(:[], k) }
last.public_send(:[]=, keys[-1], 'other')
p hash #=> {:canada=>{:ontario=>{:ottawa=>"other"}, :manitoba=>{:winnipeg=>nil}}, :united_states=>{:district_of_coloumbia=>{:washington=>nil}}}
``````
``````def get_by_keys(hash, keys)
keys.inject(hash) { |h, k| h.public_send(:[], k) }
end

def set_by_keys(hash, keys, v)
last = keys[0..-2].inject(hash) { |h, k| h.public_send(:[], k) }
last.public_send(:[]=, keys[-1], v)
hash
end

hash = { canada: { ontario: { ottawa: :me}, manitoba: { winnipeg: nil} }, united_states: { district_of_coloumbia: { washington: nil } } }

p get_by_keys(hash, keys) #=> :me
p set_by_keys(hash, keys, 'other') #=> {:canada=>{:ontario=>{:ottawa=>"other"}, :manitoba=>{:winnipeg=>nil}}, :united_states=>{:district_of_coloumbia=>{:washington=>nil}}}
``````

## Determine indices of entries in an array that start with a certain string

Tag : python , By : negonicrac
Date : March 29 2020, 07:55 AM
hop of those help? @Divakar's answer is the way to go, but just as an alternative, you can also use a list comprehension:
``````a = np.array(['test1234', 'testworld', 'hello', 'mynewcar', 'test5678'])

[i for i, si in enumerate(a) if si.startswith('test')]
``````
``````[0, 1, 4]
``````
``````np.array([i for i, si in enumerate(a) if si.startswith('test')])
`````` 