I have a FeatureCollection with a column named Dominance which has classified regions into stakeholder dominance. In this case, Dominance contains values as strings; specifically 'Small', 'Medium', 'Large' and 'Others'.
I want to replace these values/strings with 1,2,3 and 4. For that, I use the codes below:
var Shape = ee.FeatureCollection('XYZ')
var Shape_custom = Shape.select(['Dominance'])
var conditional = function(feat) {
return ee.Algorithms.If(feat.get('Dominance').eq('Small'),
feat.set({class: 1}),
feat)
}
var test = Shape_custom.map(conditional)
## This I plan to repeat for all classes
However, I am not able to change the values. The error I am getting is feat.get(...).eq is not a function.
What am I doing wrong here?
The simplest way to do this kind of mapping is using a dictionary. That way you do not need more code for each additional case.
var mapping = ee.Dictionary({
'Small': 1,
'Medium': 2,
'Large': 3,
'Others': 4
});
var mapped = Shape
.select(['Dominance'])
.map(function (feature) {
return feature.set('class', mapping.get(feature.get('Dominance')));
});
https://code.earthengine.google.com/8c58d9d24e6bfeca04e2a92b76d623a2
Related
I need some help with Google Sheets.
I have two columns, let's say A1-A100 and C1-C100. In A1-A100 I have a list of names (students), but there may be less than 100, so it could be blank from A85 to A100 for example. In C1-C100 I have grades, from 0 to 10. I need a script that auto-fills blank cells in grades (C) column with "AUS" (short for 'not present' in Spanish). But only cells corresponding to some student... so from C85 to C100, it should be left blank.
Any help would be appreciated.
Using the functions and classes from the Spreadsheet service [1], i made and tested the code for what you want to do:
function fill() {
var tss = SpreadsheetApp.getActiveSpreadsheet();
var values = tss.getRange("Sheet1!B1:B100").getValues();
for(i=0; i<values.length; i++) {
var value = values[i][0];
if (value == "") {
var rangeB = tss.getSheetByName("Sheet1").getRange(i+1,2);
var rangeA = tss.getSheetByName("Sheet1").getRange(i+1,1);
if(!rangeA.isBlank()) {
rangeB.setValue("AUS");
}
}
}
}
That function needs to be inside a script bound to the Spreadsheet, then you can add a macro [2] so you can run the function from the Sheets UI.
[1] https://developers.google.com/apps-script/reference/spreadsheet/
[2] https://developers.google.com/apps-script/guides/sheets/macros
=ARRAYFORMULA(IF((A2:A<>"")*(B2:B=""), "AUS", B2:B))
I've been trying out RethinkDB for a while and i still don't know how to do something like this MongoDB example:
https://docs.mongodb.com/manual/tutorial/map-reduce-examples/#calculate-order-and-total-quantity-with-average-quantity-per-item
In Mongo, in the map function, I could iterate over an array field of one document, and emit multiple values.
I don't know how to set the key to emit in map or return more than one value per document in the map function.
For example, i would like to get from this:
{
'num' : 1,
'lets': ['a','b,'c']
}
to
[
{'num': 1, 'let' : 'a' },
{'num': 1, 'let' : 'b' },
{'num': 1, 'let' : 'c' }
]
I'm not sure if I should think this differently in RethinkDB or use something different from map-reduce.
Thanks.
I'm not familiar with Mongo; addressing your transformation example directly:
r.expr({
'num' : 1,
'lets': ['a', 'b', 'c']
})
.do(function(row) {
return row('lets').map(function(l) {
return r.object(
'num', row('num'),
'let', l
)
})
})
You can, of course, use map() instead of do() (in case not a singular object)
I have a map reduce view:
.....
emit( diffYears, doc.xyz );
reduced with _sum.
xyz is then a number which is summed per integer(diffYears).
The output looks roughly like this:
4 1204.9
5 796.19
6 1124.8
7 1112.6
8 1993.62
9 159.26
10 395.41
11 456.05
12 457.97
13 39.80
14 483.68
15 269.469
etc..
What I would like to do is group the results as follows:
Grouping Total per group
0-4 1959.2 i.e add up the xyz's for years 0,1,2,3,4
5-9 3998.5 same for 5,6,7,8,9 ...etc.
10-14 3566.3
I saw a suggestion where a list was used on a view output here: Using a CouchDB view, can I count groups and filter by key range at the same time?
but have been unable to adapt it to get any kind of result.
The code given is:
{
_id: "_design/authors",
views: {
authors_by_date: {
map: function(doc) {
emit(doc.date, doc.author);
}
}
},
lists: {
count_occurrences: function(head, req) {
start({ headers: { "Content-Type": "application/json" }});
var result = {};
var row;
while(row = getRow()) {
var val = row.value;
if(result[val]) result[val]++;
else result[val] = 1;
}
return result;
}
}
}
I substituted var val = row.key in this section:
while(row = getRow()) {
var val = row.value;
if(result[val]) result[val]++;
else result[val] = 1;
}
(although in this case the result is a count.)
This seems to be the way to do it.
(It is like having a startkey and endkey for each grouping which I can do manually, naturally, but not inside a process. Or is there a way of entering multiple start- and endkeys into one GET command???? )
This must be a fairly normal thing to do especially for researchers using statistical analysis.
I assume therefore that it does get done but I cannot locate examples
as far as CouchDB is concerned.
I would appreciate some help with this please or a pointer in the right direction.
Many thanks.
EDIT:
Perhaps the answer lies in a process in 'reduce' to group the output??
You can accomplish what you want using a complex key. The limitation is that the group size is static and needs to be defined in the view.
You'll need a simple step function to create your groups within map like:
var size = 5;
var group = ( doc.diffYears - (doc.diffYears % size)) / size;
emit( [group, doc.diffYears], doc.xyz);
The reduce function can remain _sum.
Now when you query the view use group_level to control the grouping. At group_level=0, everything will be summed and one value will be returned. At group_level=1 you'll receive your desired sums of 0-4, 5-9 etc. At group_level=2 you'll get your original output.
I am trying to plot yearly data on a geochart. I would like the most recent data on top, but for whatever reason, the earliest year is always on top in the actual visualization.
I have tried re-ordering the table to have the latest years as the first entries in the data with no effect.
I thought that maybe it was happening because I used a view to filter my data, but the filter is not reordering the items with the older ones first (so that shouldn't impact how it is displayed).
I do not want to filter out data since I use transparency to display all points. Here is some sample code that displays the same problem:
function drawVisualization() {
var data = new google.visualization.DataTable();
data.addColumn('number', 'Latitude');
data.addColumn('number', 'Longitude');
data.addColumn('number', 'Color');
data.addColumn('number', 'Output (MW)');
data.addRows([
[35, 135, 2, 334],
[35, 135, 1, 100],
[35.1, 135.1, 1, 100],
[35.1, 135, 1, 100],
[35, 135.1, 1, 100],
[34.9, 134.9, 1, 100],
[34.9, 135, 1, 100],
[35, 135.1, 1, 100],
]);
var geochart = new google.visualization.GeoChart(
document.getElementById('visualization'));
geochart.draw(data, {
colorAxis: {
'minValue': 1,
'maxValue': 2,
'values': [1, 2],
'colors': ['black','red'],
},
'markerOpacity': 0.5,
'region': 'JP'
});
}
I can change the values in column 2 or 3 (0-indexed), or I can change the order of the entries in to the data table, but I keep getting the same result. I have a feeling it always sticks bigger sized values in the back so you can still see the little values, but I'm wondering if there is any authoritative reference on it, or any way to get around it.
This is what it looks like no matter what I do:
What I want it to look like is as follows (manipulated the SVG manually to adjust the Z-order):
I played around with it for a bit, and I think you're right: it's automatically z-indexing the markers in size-order. If I read your intent correctly, you are looking to show some subset of years, and you want the markers to be z-indexed by years. I think you can accomplish that with some custom filtering: sort your data by location and year, then for every location, filter out every year with a smaller size than any of the newer years. Something like this should work:
// order by location and year (descending)
var rows = data.getSortedRows([0, 1, {column: 2, desc: true}]);
// parse the rows backwards, removing all years where a location has a newer year with a larger size value
// we don't need to parse row 0, since that will always be the latest year for some location
var size, lat, long;
for (var i = rows.length - 1; i > 0; i--) {
size = data.getValue(rows[i], 3);
lat = data.getValue(rows[i], 0);
long = data.getValue(rows[i], 1);
for (var j = i - 1; j >= 0 && lat == data.getValue(rows[j], 0) && long == data.getValue(rows[i], 1); j--) {
if (size < data.getValue(rows[j], 3)) {
rows.splice(i, 1);
break;
}
}
}
var view = new google.visualization.DataView(data);
view.setRows(rows);
Here's a working example based on your code: http://jsfiddle.net/asgallant/36AmD/
You are correct that the order of the markers is determined by the size, with the larger markers drawn first so they end up below the smaller markers, which is a convenience for most applications. If you wish to hide 'later' markers based on order, you'll have to do that another way, perhaps by hiding the rows of data.
Is there a reason it makes sense to hide data if it covers 'earlier' data? Perhaps an option could be added to disable this automatic reordering, especially if transparent colors are used to allow you to see through.
Try this, helped me in a project:
setTimeout(function () {
$('.google-visualization-table').css("z-index", "1");
}, 500);
I'm looking every where on the web (dart website, stackoverflow, forums, etc), and I can't find my answer.
So there is my problem: I need to write a function, that print a random sort of a list, witch is provided as an argument. : In dart as well.
I try with maps, with Sets, with list ... I try the method with assert, with sort, I look at random method with Math on dart librabry ... nothing can do what I wana do.
Can some one help me with this?
Here some draft:
var element03 = query('#exercice03');
var uneliste03 = {'01':'Jean', '02':'Maximilien', '03':'Brigitte', '04':'Sonia', '05':'Jean-Pierre', '06':'Sandra'};
var alluneliste03 = new Map.from(uneliste03);
assert(uneliste03 != alluneliste03);
print(alluneliste03);
var ingredients = new Set();
ingredients.addAll(['Jean', 'Maximilien', 'Brigitte', 'Sonia', 'Jean-Pierre', 'Sandra']);
var alluneliste03 = new Map.from(ingredients);
assert(ingredients != alluneliste03);
//assert(ingredients.length == 4);
print(ingredients);
var fruits = <String>['bananas', 'apples', 'oranges'];
fruits.sort();
print(fruits);
There is a shuffle method in the List class. The methods shuffles the list in place. You can call it without an argument or provide a random number generator instance:
var list = ['a', 'b', 'c', 'd'];
list.shuffle();
print('$list');
The collection package comes with a shuffle function/extension that also supports specifying a sub range to shuffle:
void shuffle (
List list,
[int start = 0,
int end]
)
Here is a basic shuffle function. Note that the resulting shuffle is not cryptographically strong. It uses Dart's Random class, which produces pseudorandom data not suitable for cryptographic use.
import 'dart:math';
List shuffle(List items) {
var random = new Random();
// Go through all elements.
for (var i = items.length - 1; i > 0; i--) {
// Pick a pseudorandom number according to the list length
var n = random.nextInt(i + 1);
var temp = items[i];
items[i] = items[n];
items[n] = temp;
}
return items;
}
main() {
var items = ['foo', 'bar', 'baz', 'qux'];
print(shuffle(items));
}
You can use shuffle() with 2 dots like Vinoth Vino said.
List cities = ["Ankara","London","Paris"];
List mixed = cities..shuffle();
print(mixed);
// [London, Paris, Ankara]