Month: October 2022

[Solved] How to merge two DataTables like this?

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[ad_1] Here you go. Might not be pretty but does the job. No matter which DataTable has more row it will add them. private static DataTable MergeTables(DataTable dt1, DataTable dt2) { DataTable merged = new DataTable(); //copy column struct from dt1 merged = dt1.Clone(); //create columns from dt2 foreach (DataColumn col in dt2.Columns) { merged.Columns.Add(col.ColumnName); … Read more

[Solved] Android Java error:null pointer exception can’t see why?

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[ad_1] You have referenced in Your LoadingMain activity the following layout with setContentView: setContentView(R.layout.loading_main); But this Layout does not have any button1. Instead, You are trying to reference a button from another layout, from activity_main.xml btnStartProgress = (Button) findViewById(R.id.button1); This button1 is inside the activity_main.xml and You cannot reference a button in a layout that … Read more

[Solved] Android Studio (Java) Replace function [closed]

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[ad_1] In Android, inside a Layout you insert an EditText, it’s that text field you wanted where you can write text into it and also listen to text changes so you can do those manipulations you were talking about. Create a TextWatcher and add it to the EditText using addTextChangedListener(TextWatcher variable) new TextWatcher() { @Override … Read more

[Solved] How to merge multiple arrays in JavaScript with a first elements [closed]

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[ad_1] You’re looking for the Set data structure. Create a set with all the arrays you have and you’ll have the duplicates removed. To amend the other user’s answer: // Have a single array to loop through. var mainArray = []; mainArray.push([“cat”, “blue”, “1”]); mainArray.push([“cat”, “red”, “1”]); mainArray.push([“cat”, “yellow”, “1”]); mainArray.push([“dog”, “blue”, “1”]); mainArray.push([“dog”, “red”, … Read more

[Solved] Hi, can anyone tell me code how to create histogram without the toolbox (imhist,hist) from matlab?

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[ad_1] A bit more efficient than your code: histogram = zeros(1,256); for value = 1:256 % loop through possible values histogram(value) = histogram(value) + length(find(F(:)==value)); end Note that this code makes a histogram for values from 1 to 256. For grayscale images you might need one from 0 to 255. But I’ll let you change … Read more

[Solved] VBA – copy different template sheets from a workbook, into multiple sheets of another workbook based on criteria on a summary excel sheet

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[ad_1] Okay, so here’s some code to get you started. I based the names on the code you gave, which is why it was helpful. I’ve commented this a lot to try and aid your learning, there are only actually about a dozen lines of code! Note: this code will likely not work “as is”. … Read more

[Solved] Catch an exception when user enters integer value in character array [closed]

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[ad_1] Use std::none_of, along with isdigit: #include <algorithm> #include <cctype> #include <string> #include <iostream> int main() { std::string test = “abc123”; if ( std::none_of(test.begin(), test.end(), ::isdigit)) std::cout << “All good\n”; else std::cout << “You’ve entered an integer\n”; // Try with good data test = “abcdef”; if ( std::none_of(test.begin(), test.end(), ::isdigit)) std::cout << “All good\n”; else … Read more