miscellaneous.js

/**
 * Creates an object containing the specified Booleans.
 * 
 * @param isFeas       Boolean containing whether the problem is feasible.
 * @param isOptim      Boolean containing whether the problem is optimal.
 * @param isUnbounded  Boolean containing whether the problem is unbounded.
 * @param isPermInf    Boolean containing whether the problem is permanently 
 * infeasible.
 * @param isAltSol     Boolean containing whether an alternate solution is 
 * being displayed.
 * @param befAltSol    Boolean containing whether this function is being called
 * before an alternate solution is displayed.
 */
function Bools(isFeas, isOptim, isUnbounded, isPermInf, isAltSol, befAltSol) {
    this.isFeas = isFeas;
    this.isOptim = isOptim;
    this.isUnbounded = isUnbounded;
    this.isPermInf = isPermInf;
    this.isAltSol = isAltSol;
    this.befAltSol = befAltSol;
}

/**
 * A function used to copy arrays/objects on assignment. 
 * If finalA = copyOnAss(A), then if A is updated finalA won't be.
 * 
 * @param locA     Array/object.
 * @return         Same array/object except copied on assignment.
 */
function copyOnAss(locA) {
    // Using JSON funcs to copy without reference
    var finalObj = {locA: locA};
    var finalJSON = JSON.stringify(finalObj);
    var parsedFinal = JSON.parse(finalJSON);

    return parsedFinal.locA;
}

/**
 * Determine whether specified number is an integer.
 * 
 * @param number   Number we're checking for whether it's an integer.
 * @return         A Boolean indicating whether the specified number is an 
 * integer.
 */
function isInt(number) {
    var numFrac = math.fraction(number);
    if ( numFrac.d == 1 ) {
        return true;
    } else {
        return false;
    }
}

/**
 * A new slack variable.
 * 
 * @param x   1d array of x variable strings.
 * @return    New slack variable name.
 */
function newSlackVariable(x) {
    var mn = x.length;
    var finalSlack = x[mn-1];
    var finalSlackLet = finalSlack.replace(/\d+/, '');
    var finalSlackNo = parseInt(finalSlack.replace(finalSlackLet, ''));
    return finalSlackLet + (finalSlackNo + 1);
}

/**
 * A number new slack variables whose name starts with the letter part of 
 * the final slack variable in x
 * 
 * @param x        1d x array that ends in the slack variables of the problem.
 * @param number   Number of new slack variables to be returned.
 * @return         1d array of new slack variables to be added.
 */
function newSlackVariables(x, number) {
    var newxBRows = [newSlackVariable(x)];
    for (let i = 0; i < number - 1; i++) {
        newxBRows.push(newSlackVariable(newxBRows));
    }
    return newxBRows;
}

/* The below block of code was adapted from:
https://stackoverflow.com/a/24490947/1876983
* It allows radio boxes to be unchecked if the user is pressing Ctrl
*/
document.addEventListener('click', function(e){
    if (e.ctrlKey == true && 
        e.target.type == "radio" && 
        e.target.checked == true) {
        e.target.checked = false;
    }
 });