Cubism callback array seemingly replaced - callback

I'm using some static data to generate charts using cubism's context.metric function. However, all of the charts end up displaying the same array of values (the last one passed in) although I passed in different arrays in the callback function.
var metrics = [];
for (var key in toGraph) {
var m = context.metric(function(start, stop, step, callback) {
callback(null, toGraph[key]);
}, key);
metrics.push(m);
}
toGraph is a dictionary with key being the name of each metric and the value being an array of the metric values.
The values ended up being displayed are always the last array of values I pass in.
I couldn't figure out what's wrong. Am I using context.metric wrong or using the callback function wrong? Any help would be greatly appreciated, thank you!

You can take a look at this example - http://bl.ocks.org/syntagmatic/5803524

Turns out it was a javascript closure inside loop problem.
Examples like this and this explained the problem.

Related

How to assign value to a element in 2D list in python

For mentioned python code I am getting result as [[0,4,2],[0,4,2]]. Here '2', I am passing dynamically. I want result as [[0,1,2],[0,4,2]], how can I get this?
a = [[0,1,2]]*2
a[1][1] = 4
The issue is in a way you create 2d list a. It holds links to same strings in each row.
Proper way to create it:
a = [[0,1,2] for i in range(2)]
Found here.

How to get column title for each row entry

I am using a row id to obtain the cells for a single row. However, the response returns the column id but not the title of the column. In an attempt to make the code readable for others it would be helpful to also obtain the column title. I was thinking of doing this by using the column id that is obtained in the getRow function but I am not entirely sure how to catch it. Below is the basic getRow function for reference. I appreciate any assistance. Thank you in advance all.
smartsheet.sheets.getRow(options)
.then(function(row) {
console.log(row);
})
.catch(function(error) {
console.log(error);
});
My preferred way of addressing this is to dynamically create a column map on my first GET /sheets/{sheetId} request.
Let's say we have a sheet with three columns: Japan, Cat, and Cafe. Here is one way to make a column map.
const columnMap = makeColumnMap(<your sheet data>);
function makeColumnMap(sheetData){
const colMap = {};
sheetData.columns.map( column => colMap[column.title] = column.id);
return colMap;
}
Now, you can reference your specific columns like this: columnMap["Japan"], columnMap["Cat"], and columnMap["Cafe"] or you can use dot notation if you prefer.
Basically, what we're doing is creating a dictionary to map the column titles to the corresponding column id.
Posting this as a separate answer based on your response (and for easier formatting).
I have a couple specific recommendations that will help you.
Try to consolidate your API calls.
I then want to use that columnID to call getColumns(columnId) to obtain the title.
This is 'work' that you don't need to do. A single GET /sheets/{sheetId} will include all the data you need in one call. It's just a matter of parsing the JSON response.
Use this as an opportunity to improve your ability to work with JSON.
I do not know how to catch the columnId once getRow() is called.
The response is a single object with nested arrays and objects. Learning to navigate the JSON in a way that makes sense to you will come in really handy.
I would recommend saving the response from a GET sheet call as it's own JSON file. From there, you can bring it into your script and play with your logic to reference the values you want.

Matlab bad cell reference operation when if statement

I have a <850x1> cell called x. Each of the individual structures has a 'Tag' name and 'Data' cell with <7168x1 double> data values.
(i.e.
x{1,1}.Tag = 'Channel1', x{1,1}.Data= <7168x1 double>)
So, I want to go through the x cell, identify the structures with 'Channel1' Tag names and pull out that structure's data. Then, combine the data into a cell called Ch1. Here is my approach so far:
n=1:850
if x{n,1}.Tag == 'Channel1'
Ch1{:,n} = x{n,1}.Data;
end
However, this gives an error: Bad cell reference operation.
Any ideas what may be going wrong?
There are 2 issues here. First, your if statement will compare each entry in the string x{n,1}.Tag to each entry in the string 'Channel1'. If the dimensions are not the same, you will get an error. To fix this, you could use the string compare function, strcmp. The other issue is that you are assigning n to all values between 1 and 850 at once. This is the issue that is producing the actual error you are seeing. Instead, you want to step through each of these values one at a time with a for loop. I would suggest trying the following code:
for n=1:850
if strcmp(x{n,1}.Tag, 'Channel1')
Ch1{:,n} = x{n,1}.Data;
end
end

Matlab saving without losing previous iteration's value

i'm trying to save values of iterations in a loop. After this function, they will execute other functions before coming to the next iteration. But the problem i'm facing is, it overwrites them and bcomes 000000. Only the last iteration values are seen. How can i fix it ? Is there a way not to use the same variable and save them ? i read about append but will have to use different var name n is not really nice to do so.
function DistanceMatrix(iteration,distance_row)
load('data.mat','oridata')
load('centroids.mat','centroids')
for i = distance_row:(distance_row+3)
for j=1:300 %no.genes
total=0;
for k=1:6
total=total+((oridata(j,k)- centroids(i,k))^2);
end
DistMatrix_Val(i,j)=sqrt(total);
end
end
save('DistanceMatrix.mat','DistMatrix_Val')
DistMatrix_Val;
GroupMatrix(iteration,distance_row)
end
This is the output. I WOULD LIKE TO STORE ALL ITERATION's value and not overwrite them. Can any1 help ?
OK. Use
load('DistanceMatrix.mat','DistMatrix_Val')
or
persistent DistMatrix_Val
just before the first load command you showed to us.
I think this is what you should do:
functon DistanceMatrix = DistanceMatrix(iteration,distance_row)
Rather than saving the variable at the end of the function, you return it.
After returning it you can include the variable in a bigger variable (for example a three dimensional Nx4x300 matrix)
If neccesary you can then save it at the end.

How to set BottonDownFcn to return the items place in the ordering like gname

I am looking for a function like gname to assign it to a point's callback
and when someone click on that point I could be able to retrieve its place
in the ordering of data.
Thanks.
I had a very hard time but used the UserData field to send the information in a for loop and
assign the value to each point as property and then simply getting it through dynamic callback.