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How do i iterate values from a 2d array using conditions


How do i iterate values from a 2d array using conditions

By : Baruc Baptista
Date : December 01 2020, 05:00 PM
hop of those help? I have two arrays array 1 and array2.I want to use array 1 data as key and array 2 data as value in a hash map , You can try something like,
code :
public static void main(String[] args) {

        int[] array1 = { 1, 2, 3, 4, 5 };   

        String[][] array2 = { { "open", "1", "2", "7" }, { "3", "3", "4", "r" } ,{ "close", "3", "4", "ff" },{ "open", "3", "4", "close" },{ "55", "3", "4", "f" },{ "close", "3", "4", "rr" }};

        HashMap<Integer, List<String>> hm= new HashMap<Integer, List<String>>();

        for(int i=0;i<array1.length;i++){
            List<String> list = new ArrayList<String>();
            for(String str : array2[i]){
                list.add(str);
            }
            hm.put(i, list);
        }

        for(Integer intKey : hm.keySet()){
            System.out.println(intKey + " : " + hm.get(intKey));
        }
    }
public static void main(String[] args) {

        int[] array1 = { 1, 2, 3, 4, 5 };   

        String[][] array2 = { { "open", "1", "2", "7" }, { "3", "3", "4", "r" } ,{ "close", "3", "4", "ff" },{ "open", "3", "4", "close" },{ "55", "3", "4", "f" },{ "close", "3", "4", "rr" }};

        HashMap<Integer, List<List<String>>> hm= new HashMap<Integer, List<List<String>>>();


        int savePoint = 0;
        boolean flag = false;
        for(int i=0;i<array1.length;i++){


            List<List<String>> listSet = new ArrayList<List<String>>();

            for(int j = savePoint ; j < array2.length ; j++){
                List<String> list = new ArrayList<String>();

                savePoint++;

                for(String str : array2[j]){
                    list.add(str);
                }

                flag = true;
                listSet.add(list);

                if(list.get(0).contains("close")){

                    break;
                }

            }

            if(flag){
                hm.put(array1[i], listSet);
                flag= false;
            }
        }

        for(Integer intKey : hm.keySet()){
            System.out.println(intKey + " : " + hm.get(intKey));
        }
    }


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How to iterate over this dataframe with fixed values and unique conditions corresponding to the 1st trial?

How to iterate over this dataframe with fixed values and unique conditions corresponding to the 1st trial?


By : foysal
Date : March 29 2020, 07:55 AM
it fixes the issue Hello I have such a dataframe as this: , Solution
Using dplyr:
code :
library(dplyr)
df <- df %>%
    group_by(Gas, Replicate) %>%
    mutate(n_subB = ((Pressure_B-first(Pressure_B))*V_sub_B)/(R*Temperature))
# A tibble: 42 x 4
# Groups:   Gas, Replicate [3]
   Replicate Trial    Gas       n_subB
       <int> <int> <fctr>        <dbl>
 1         1     1    CO2 0.0000000000
 2         1     2    CO2 0.0008573223
 3         1     3    CO2 0.0102878671
 4         1     4    CO2 0.0162891229
 5         1     5    CO2 0.0214330565
 6         1     6    CO2 0.0274343123
 7         1     7    CO2 0.0325782458
 8         1     8    CO2 0.0377221794
 9         1     9    CO2 0.0428661130
10         1    10    CO2 0.0480100465
11         1    11    CO2 0.0531539801
12         1    12    CO2 0.0582979136
13         1    13    CO2 0.0634418472
14         1    14    CO2 0.0677284585
15         2     1    CO2 0.0000000000
16         2     2    CO2 0.0051439336
Iterate through array and sum if conditions met

Iterate through array and sum if conditions met


By : etech22
Date : March 29 2020, 07:55 AM
Any of those help I'm having trouble figuring out how to map out a solution for this problem... and ideas? , Try something like this:
code :
const over30 = ListOfPeople.map(p => {
    if (Array.isArray(p.age)) {
        // Copy the object so we don't mutate the original
        p = Object.assign({}, p);
        p.age = p.age.reduce((sum, v) => sum + v, 0);
    }
    return p;
}).filter(p => p.age >= 30);
console.log(over30);
Using JavaScript arrow function iterate an array and create array inside array based on conditions?

Using JavaScript arrow function iterate an array and create array inside array based on conditions?


By : user1690040
Date : March 29 2020, 07:55 AM
With these it helps You could take a single loop approach with an object for collecting objects with id as key.
code :
var data = [{ id: 3, is_child_question: true, parent_question_id: 2 }, { id: 2, is_child_question: true, parent_question_id: 1 }, { id: 1, is_child_question: false, parent_question_id: null }],
    tree = data.reduce((r, o) => {
        o.children = r[o.id] && r[o.id].children;
        r[o.id] = o;
        r[o.parent_question_id] = r[o.parent_question_id] || {};
        r[o.parent_question_id].children = r[o.parent_question_id].children || [];
        r[o.parent_question_id].children.push(o);
        return r;
    }, {}).null.children;

console.log(tree);
.as-console-wrapper { max-height: 100% !important; top: 0; }
Need to iterate over row to check conditions and retrieve values from different columns if the conditions are met

Need to iterate over row to check conditions and retrieve values from different columns if the conditions are met


By : user2660657
Date : March 29 2020, 07:55 AM
this one helps. I have a daily price data for a stock. Pasting last 31 rows of the data as an example dataset as below: , The right answer is to add a line of code as below:
code :
df[['max2', 'RSI2']] = df[['max', 'RSI']].dropna(subset=['max']).shift(1).fillna(0)
Smalltalk - iterate over a dict array with conditions

Smalltalk - iterate over a dict array with conditions


By : Srijan Parmeshwar
Date : March 29 2020, 07:55 AM
This might help you To test whether a Collection contains an element that matches a condition, use anySatisfy:. It answers true iff there is a matching element.
code :
dictArray anySatisfy: [:each | (each at: 'name') = aName and: [(each at: 'age') = anAge]]
anySatisfy: aBlock
   self do: [:each | (aBlock value: each) ifTrue: [^ true]].
   ^ false
dictArray do:
   [:each |
   ((each at: 'name') = aName and: [(each at: 'age') = anAge])
      ifTrue: [^ true]].
^ false
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