215 lines
3.0 KiB
Markdown
215 lines
3.0 KiB
Markdown
---
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id: 599c333915e0ea32d04d4bec
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title: Element-wise operations
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challengeType: 5
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forumTopicId: 302252
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dashedName: element-wise-operations
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---
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# --description--
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Implement basic element-wise matrix-matrix and scalar-matrix operations.
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**Implement:**
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<ul>
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<li>addition</li>
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<li>subtraction</li>
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<li>multiplication</li>
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<li>division</li>
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<li>exponentiation</li>
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</ul>
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The first parameter will be the operation to be performed, for example, "m_add" for matrix addition and "s_add" for scalar addition. The second and third parameters will be the matrices on which the operations are to be performed.
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# --hints--
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`operation` should be a function.
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```js
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assert(typeof operation === 'function');
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```
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`operation("m_add",[[1,2],[3,4]],[[1,2],[3,4]])` should return `[[2,4],[6,8]]`.
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```js
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assert.deepEqual(
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operation(
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'm_add',
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[
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[1, 2],
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[3, 4]
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],
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[
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[1, 2],
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[3, 4]
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]
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),
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[
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[2, 4],
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[6, 8]
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]
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);
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```
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`operation("s_add",[[1,2],[3,4]],2)` should return `[[3,4],[5,6]]`.
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```js
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assert.deepEqual(
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operation(
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's_add',
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[
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[1, 2],
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[3, 4]
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],
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2
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),
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[
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[3, 4],
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[5, 6]
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]
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);
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```
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`operation("m_sub",[[1,2],[3,4]],[[1,2],[3,4]])` should return `[[0,0],[0,0]]`.
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```js
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assert.deepEqual(
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operation(
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'm_sub',
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[
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[1, 2],
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[3, 4]
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],
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[
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[1, 2],
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[3, 4]
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]
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),
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[
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[0, 0],
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[0, 0]
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]
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);
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```
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`operation("m_mult",[[1,2],[3,4]],[[1,2],[3,4]])` should return `[[1,4],[9,16]]`.
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```js
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assert.deepEqual(
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operation(
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'm_mult',
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[
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[1, 2],
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[3, 4]
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],
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[
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[1, 2],
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[3, 4]
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]
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),
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[
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[1, 4],
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[9, 16]
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]
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);
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```
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`operation("m_div",[[1,2],[3,4]],[[1,2],[3,4]])` should return `[[1,1],[1,1]]`.
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```js
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assert.deepEqual(
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operation(
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'm_div',
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[
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[1, 2],
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[3, 4]
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],
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[
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[1, 2],
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[3, 4]
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]
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),
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[
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[1, 1],
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[1, 1]
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]
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);
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```
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`operation("m_exp",[[1,2],[3,4]],[[1,2],[3,4]])` should return `[[1,4],[27,256]]`.
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```js
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assert.deepEqual(
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operation(
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'm_exp',
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[
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[1, 2],
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[3, 4]
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],
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[
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[1, 2],
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[3, 4]
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]
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),
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[
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[1, 4],
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[27, 256]
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]
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);
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```
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`operation("m_add",[[1,2,3,4],[5,6,7,8]],[[9,10,11,12],[13,14,15,16]])` should return `[[10,12,14,16],[18,20,22,24]]`.
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```js
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assert.deepEqual(
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operation(
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'm_add',
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[
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[1, 2, 3, 4],
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[5, 6, 7, 8]
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],
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[
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[9, 10, 11, 12],
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[13, 14, 15, 16]
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]
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),
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[
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[10, 12, 14, 16],
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[18, 20, 22, 24]
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]
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);
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```
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# --seed--
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## --seed-contents--
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```js
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function operation(op, arr1, arr2) {
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}
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```
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# --solutions--
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```js
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function operation(op, arr1, arr2) {
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const ops = {
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add: ((a, b) => a + b),
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sub: ((a, b) => a - b),
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mult: ((a, b) => a * b),
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div: ((a, b) => a / b),
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exp: ((a, b) => Math.pow(a, b))
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};
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const ifm = op.startsWith('m');
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const doOp = ops[op.substring(2)];
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for (let i = 0; i < arr1.length; i++) {
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for (let j = 0; j < arr1[0].length; j++) {
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arr1[i][j] = doOp(arr1[i][j], (ifm) ? (arr2[i][j]) : (arr2));
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}
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}
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return arr1;
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}
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```
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