# How can I improve the performance of this Google Sheets custom function?

B

##### Guest
blade_runner Asks: How can I improve the performance of this Google Sheets custom function?
I have a Google Sheets project that uses this custom function 50-100 times, so I'm trying to make the function as efficient as possible. The function filters data that is written to the INPUT worksheet (via the Google API) and then draws a table for a subset of the data.

I have provided a working sample spreadsheet here: Table Builder Sample

The 'META' worksheet is simply to trigger the custom function to run (i.e. mimic the INPUT sheet being populated via the Google API) by changing the value in cell A1, which is an argument for the custom function call.

The 'INPUT' sheet contains sample input data. The greyed out columns (B, D, F, J, K) are not used by the function.

The 'TABLE_CONFIG' sheet contains the config attributes of the table. This sheet must remain as is.

The 'RESULTS_Pilot' and 'RESULTS_Co-Pilot' sheets are examples of how the custom function is called from various places throughout the spreadsheet. The headers are static. The results table must always be returned to display in the format shown in the sample.

I am fairly new to coding and very new to Google Apps Script. The custom function is working, but I am hoping for tips on speeding it up, or pointers where my code is inefficient or redundant.

Thank you.

Code:
// Filters INPUT by Group Id and Role. Called from getTable().
function filterInput(group, role) {
var range = sheet.getDataRange();
var values = range.getValues();
var results = [];
values.forEach(function (row) {
if (row[2] === group && row[8] === role) {
results.push(row);
}
});
return results;
}

// Builds matrix. Called from getTable().
let generateMatrix = function (m, n, value) {
let matrix = [];
for (let i = 0; i < m; i++) {
let row = [];
for (let j = 0; j < n; j++) {
row.push(value);
}
matrix.push(row);
}
return matrix;
};

// Main function called from RESULTS_Pilot and RESULTS_Co-Pilot worksheets
function getTable(groupUUID, configSheetName, role) {
// Filter INPUT tab to get only rows for group and role
values = filterInput(groupUUID, role);
// If filtered INPUT contains 0 rows, return empty string
if (values.length === 0) {
Logger.log("There are no matching rows in INPUT.");
return ("");
}
else {
Logger.log("There are " + values.length + " filtered rows for the specified group and role.");
var range = sheet.getDataRange();
var configValues = range.getValues();
var configFields = 0;
var rowNum = 0;
var uniqueInstanceRows = 0; // Need to find the number of unique instance rows (i.e. unique Instance Ids) to build table
var colValues = []; // Create array with only first column values (Instance Ids) from filtered input rows
for (i = 0; i < values.length; i++) {
colValues.push(values[i][0]);
}

const unique = (value, index, self) => { return self.indexOf(value) === index; } // Get only unique Instance Ids from array
var Unique_List = colValues.filter(unique);
uniqueInstanceRows = Unique_List.length; // Will be used to build empty table using generateMatrix()
Logger.log("# of unique Instance Id rows: " + uniqueInstanceRows);

configValues.forEach(function (configRow) { // Count number of config fields for the group in TABLE_CONFIG worksheet
if (configRow[3] === groupUUID && configRow[2] !== "") {
configFields = configFields + 1;
}
})
Logger.log("There are " + configFields + " config fields.");

// Generate table structure
table = generateMatrix(uniqueInstanceRows + 1, configFields, "");

// Fill first column in results table with unique Instance Ids
for (i = 0; i < Unique_List.length; i++) {
table[i][0] = Unique_List[i];
}

// Generate a table to store Instance Id / File Id pairs
pairsTable = generateMatrix(Unique_List.length, 2, "");
values.forEach(function (row) {
for (i = 0; i < Unique_List.length; i++) {
if (row[0] === Unique_List[i]) {
pairsTable[i][0] = Unique_List[i];
pairsTable[i][1] = row[7];
}
}
})

// Fill last column in results table with corresponding File Ids
table.forEach(function (row, index) {
for (i = 0; i < pairsTable.length; i++) {
if (row[0] === pairsTable[i][0]) {
table[index][configFields + 1] = pairsTable[i][1];
}
}
})

// Populate results table with remaining group field values
values.forEach(function (row) {
configValues.forEach(function (configRow) {
if (row[4] === configRow[0] && configRow[2] !== "") {
for (i = 0; i <= Unique_List.length; i++) {
if (row[0] === Unique_List[i]) {
rowNum = i;
}
}
let val = row[6];
table[rowNum][configRow[2]] = val;
}
})
})
// Return results table
return table;
}
}

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#### [Solved] Extract Data from Corrupted TerraSync file, Pathfinder can't correct & won't open

• Kevin Nolan
• Geography
• Replies: 0
Kevin Nolan Asks: Extract Data from Corrupted TerraSync file, Pathfinder can't correct & won't open
I had an employee recording points for a project with a Trimble Geo XT 7 series receiver attached to a Zephyr 2 external antenna. The receiver went to sleep between collecting episodes. Upon attempting to re-open, the file came back as corrupted and TerraSync was unable to fix and open the file. I have never had an unrecoverable corruption and didn't expect this to be a permanent problem. We stared a new file and finished collecting data.

However, now Pathfinder cannot fix and refuses to open the corrupted file. I copied the corrupted file parts to a separate folder manually (Pathfinder won't transfer file). I can open the individual files that show up in Windows Explorer (*.dd, *.gic, *.gip, *.gis, *giw, *.gix, *.obs, *.obx) in various programs (Notepad, Word, Excel), but only user-entered data (comments, notes, text fields from data dictionary form) show up as readable text. The rest is various combinations of numbers, letters, and symbols. I need to extract the coordinate data from this file, even if I can't postprocess and correct it.

Is there any way to translate the data displayed as symbols into text and numbers so that I can see the coordinates?

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#### [Solved] How to snap lines from the same layer together?

• Geowhat
• Geography
• Replies: 0
Geowhat Asks: How to snap lines from the same layer together?
I did a Network Analysis and this is the outcome. How can I snap lines from the same layer together?

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#### [Solved] Publish a Query Layer as a Feature Access Service - ArcGIS Server

a1234 Asks: Publish a Query Layer as a Feature Access Service - ArcGIS Server
I am connecting to a SQL Server 2016 database, and adding data into ArcMap 10.3.1 as a Query Layer.

I want to publish this data as a Feature Access service to ArcGIS Server 10.3.1. I have no problems publishing this data as a mapping service. However, when I want to enable Feature Access, I get 00223: Query layer has virtual column error.

I have read the documentation on this error, and the only solution is to "Change the query definition of your layer so it no longer contains a virtual column or columns".

I have tried several different ways to alter the sql query (very simple queries), and all still produce this same error.

What is a virtual column? How can I publish a Query Layer as a Feature Access service?

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#### Doubt about Electromagnetic Attraction b/w Electromagnet-Iron vs Electromagnet-Electromagnet

• J.Doe
• Physics
• Replies: 0
J.Doe Asks: Doubt about Electromagnetic Attraction b/w Electromagnet-Iron vs Electromagnet-Electromagnet
https://www.supermagnete.de/eng/faq...the-combination-magnet-magnet-and-magnet-iron

At full contact, the attractive force between a raw magnet and an iron plate is the same as the attractive force between two raw magnets. However, with increasing distance, the attraction diminishes faster than the attraction between two raw magnets (see graph)

I am confused by this:

1. Consider two identical Electromagnets touching each other in one case and a single electromagnet touching an iron plate in second case. Won't the attraction be more in the first case as both magnets are exerting a pull on each other where as in second case the magnet is pulling on a passive iron plate (which has temporarily induced magnetism)?

2. For two cylindrical electromagnets with poles at distance $x$ repelling each other (they are relatively close by i.e. $10*R > x$ where $R$=radius of pole) how does the force exerted on each electromagnet change with increase in current ($I$)? Can someone help with this formula?

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#### Closing a Graph

sam wolfe Asks: Closing a Graph
Consider the following graph g

I want to "close" it by adding the following edges

Alternatively, I would also be happy with something like

where I've added four "corner" vertices.

Now, this question is, in a way, a follow up to this answer, where I initially have a picture on which I draw a graph, as follows

Is it possible to turn the picture into a rectangle-shaped graph and then join them in somehow? This would lead to something like the second example.

Alternatively, I also thought about simply uniting 1-degree vertices that are close to each other, creating the first example graph.

In the end, I want a graph that defines a mesh, thus the need of "closing" the graph in this fashion. Ideally, I want KVertexConnectedGraphQ[g] = True for the closed graph.

Any ideas?

Edit 1: Note that my goal is to be able to do this for general graphs. For example, considering the graph

I want to get something like

I guess using something like ConvexHull (which doesn't correspond to what is drawn) in some matter could help my goal, but at this point I'm entirely sure how.

Edit 2: In order to be more practical consider the graph given by

Code:
g = Graph[{1 \[UndirectedEdge] 10, 2 \[UndirectedEdge] 9,
3 \[UndirectedEdge] 9, 4 \[UndirectedEdge] 12,
5 \[UndirectedEdge] 8, 6 \[UndirectedEdge] 13,
7 \[UndirectedEdge] 14, 8 \[UndirectedEdge] 11,
8 \[UndirectedEdge] 17, 9 \[UndirectedEdge] 20,
10 \[UndirectedEdge] 11, 10 \[UndirectedEdge] 21,
11 \[UndirectedEdge] 25, 12 \[UndirectedEdge] 18,
12 \[UndirectedEdge] 19, 13 \[UndirectedEdge] 18,
13 \[UndirectedEdge] 27, 14 \[UndirectedEdge] 15,
14 \[UndirectedEdge] 19, 16 \[UndirectedEdge] 17,
17 \[UndirectedEdge] 23, 18 \[UndirectedEdge] 24,
19 \[UndirectedEdge] 22, 20 \[UndirectedEdge] 21,
20 \[UndirectedEdge] 27, 21 \[UndirectedEdge] 34,
22 \[UndirectedEdge] 26, 22 \[UndirectedEdge] 29,
23 \[UndirectedEdge] 31, 23 \[UndirectedEdge] 33,
24 \[UndirectedEdge] 29, 24 \[UndirectedEdge] 30,
25 \[UndirectedEdge] 31, 25 \[UndirectedEdge] 34,
27 \[UndirectedEdge] 28, 28 \[UndirectedEdge] 32,
28 \[UndirectedEdge] 38, 29 \[UndirectedEdge] 37,
30 \[UndirectedEdge] 32, 30 \[UndirectedEdge] 35,
31 \[UndirectedEdge] 39, 32 \[UndirectedEdge] 41,
34 \[UndirectedEdge] 36, 35 \[UndirectedEdge] 42,
35 \[UndirectedEdge] 44, 36 \[UndirectedEdge] 45,
36 \[UndirectedEdge] 54, 37 \[UndirectedEdge] 40,
37 \[UndirectedEdge] 44, 38 \[UndirectedEdge] 45,
38 \[UndirectedEdge] 48, 39 \[UndirectedEdge] 47,
39 \[UndirectedEdge] 53, 41 \[UndirectedEdge] 42,
41 \[UndirectedEdge] 48, 42 \[UndirectedEdge] 56,
43 \[UndirectedEdge] 46, 44 \[UndirectedEdge] 51,
45 \[UndirectedEdge] 55, 46 \[UndirectedEdge] 47,
46 \[UndirectedEdge] 52, 47 \[UndirectedEdge] 49,
48 \[UndirectedEdge] 50},
VertexCoordinates -> {{102.5, 175.5}, {84.5, 152.5}, {108.5,
175.5}, {133.5, 153.5}, {152.5, 175.5}, {244.5,
175.5}, {254.5, 148.5}, {43.5, 174.5}, {43.5,
170.5}, {196.5, 174.5}, {202.5, 147.5}, {297.5,
174.5}, {309.5, 147.5}, {63.5, 148.5}, {10.5,
141.5}, {143.5, 117.5}, {119.5, 109.5}, {67.5,
94.5}, {236.5, 131.5}, {293.5, 127.5}, {180.5,
89.5}, {312.5, 146.5}, {4.5, 143.5}, {18.5,
97.5}, {253.5, 95.5}, {301.5, 98.5}, {110.5,
75.5}, {313.5, 93.5}, {286.5, 83.5}, {52.5, 80.5}, {4.5,
76.5}, {236.5, 82.5}, {181.5, 86.5}, {187.5,
80.5}, {168.5, 31.5}, {297.5, 37.5}, {244.5,
49.5}, {59.5, 29.5}, {216.5, 27.5}, {125.5,
38.5}, {225.5, 26.5}, {280.5, 23.5}, {152.5,
20.5}, {110.5, 3.5}, {313.5, 29.5}, {199.5, 7.5}, {32.5,
7.5}, {85.5, 3.5}, {236.5, 3.5}, {4.5, 25.5}, {10.5,
16.5}, {281.5, 4.5}, {155.5, 3.5}, {4.5, 3.5}, {34.5,
4.5}, {199.5, 4.5}},
VertexSize -> 3 {1, 1}, VertexStyle -> Red,
EdgeStyle -> Directive[Black]]

which yields the first graph g. Then, the code

Code:
hm = ConvexHullMesh[
Transpose[
Select[{GraphEmbedding[g], VertexDegree[g]} //
Transpose, #[[2]] == 1 &]][[1]]]
gb = Graph[hm["Edges"], VertexCoordinates -> MeshCoordinates[hm],
VertexSize -> 3 {1, 1}, VertexStyle -> Red,
EdgeStyle -> Directive[Black]]

yields

Now, how do I merge both graphs? I tried GraphUnion, but I would need the correct VertexCoordinates. Could it be simply an ordering problem? Any suggestion?

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#### Showing an inequality in vector space.

Hamdiken Asks: Showing an inequality in vector space.
Let $E$ be a normed vector space. We define a linear form $T:E\rightarrow \mathbb R$. Denote $H=Ker(T)$.

• Show that if $T$ is continuous, then $H$ is a closed set.

$H$ is the continuous inverse of a closed set ($\{0\}$), hence closed.

• Suppose that $H$ is closed. Let $a\in E$ such that $T(a)=1$. Show that the set $a+H$ is closed and does not contain $0$.

My guess is that since the set $\{a\}$ is bounded, and since $H$ is closed in a vector space, which means it's also bounded, gives the result that $a+H$ is closed. As for the $0$, we have for every $y\in a+H$, $T=T(a+x)=T(a)+T(x)=1$. However $T(0)=0\neq1$, so $0\notin a+H$.

• Deduce the existence of $r>0$ such that $B(0,r)\cap(a+H)=\emptyset$.

Since $0\notin a+H$, there exists a neighbourhood $V_0$ of $0$ such that $V_0\cap(a+H)=\emptyset$, hence the existence of an open ball $B(0,r)$ such that $B(0,r)\cap(a+H)=\emptyset$.

• Show that for every $x\in B(0,r)$, we have $$|Tx|\leq 1$$

This is where I stopped. I thought of the orthogonal projection but didn't understand how to proceed.

Any help and correction of the answers above will be highly appreciated.

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#### Monotone likelihood ratio for logistic distribution $f(x;\theta) = e^{-x - \theta} (1 + e^{-x - \theta})^{-2}$

Balkys Asks: Monotone likelihood ratio for logistic distribution $f(x;\theta) = e^{-x - \theta} (1 + e^{-x - \theta})^{-2}$
This is a question from Problems 9.4 of An Introduction to Probability and Statistics by Rohatgi.

Let $X$ have logistic distribution with the PDF $$f(x;\theta) = e^{-x - \theta} (1 + e^{-x - \theta})^{-2}, x \in \mathbb{R}.$$ Does ${f}$ have a monotone likelihood ratio?

I have tried to look at this related question, but the theory was beyond what I have learned.

My attempt: Let $\theta_1, \theta_0 \in \mathbb{R}$. Let $\theta_1 > \theta_0.$

Consider the likelihood ratio, $T_{NP}(\mathbf{x}) = \dfrac{f_n(\mathbf{x};\theta_1)}{f_n(\mathbf{x};\theta_0)} = \dfrac{ e^{-n \bar{x} - n \theta_1} \prod (1+e^{-x_i - \theta_1})^{-2} }{ e^{ -n \bar{x} - n \theta_0} \prod (1+e^{-x_i - \theta_0})^{-2} }.$

After simplifying more, I get $T_{NP}(\mathbf{x}) = e^{n(\theta_0 - \theta_1)} \prod \left(\dfrac{1+e^{-x_i - \theta_0}}{1+e^{-x_i - \theta_1}}\right)^2.$

I found that $\dfrac{d}{dx} \dfrac{1+e^{-x - \theta_0}}{1+e^{-x - \theta_1}}$ was negative for all $x$.

I tried to relate this to what I had done so far. I used that $\log$ is monotone increasing. Taking the log of the likelihood ratio, I get that the log-likelihood ratio is decreasing in $\sum \log \left(\dfrac{1+e^{-x_i - \theta_0}}{1+e^{-x_i - \theta_1}}\right).$ However, I am not sure how to get the required test statistic that is independent of the parameter $\theta$.

I think that a relevant result is that for a distribution from the exponential family, $f(x;\theta) = c(\theta)h(x)\exp(\pi(\theta)T(x))$, the likelihood ratio is monotone in $T(x)$.

I tried to use this by writing $f(x;\theta) = \exp{(-x-\theta)} \exp{(-2\log(1+e^{-x-\theta}))}.$ But I cannot identify $T(x)$ from this form.

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