I've had EPPlus (Office Open XML) working on a Azure Web Role for some time now, but I've been experimenting with Azure Web Sites lately and there I'm getting a very weird error;
[DivideByZeroException: Attempted to divide by zero.]
System.Decimal.FCallDivide(Decimal& d1, Decimal& d2) +0
OfficeOpenXml.Drawing.ExcelDrawing.SetPixelWidth(Int32 pixels, Single dpi) +465
Compliance.Net.CommonCode.PivotGenerator.GeneratePivotTable(ExcelWorksheet dataWorksheet, ExcelWorksheet pivotWorksheet, Int32 endRow)
I am getting this on the same data and code as is running on Azure Web Role.
Edit:
The offending lines look like this:
var chart = pivotWorksheet.Drawings.AddChart("PivotChart", eChartType.ColumnClustered, pivotTable);
chart.SetPosition(endRow + 2, 20, 1, 10);
chart.SetSize(600, 400);
Please note that I have made sure that 'endRow' is > 1.
Any ideas?
Having had the same issue myself I've pulled the EPPlus source and done some sleuthing.
The issue is in ExcelWorkbook.cs line 283 which calls
System.Windows.Forms.TextRenderer.MeasureText(string,Font).Width
which appears to return Zero in an Azure website.
I've just added a line
if (_standardFontWidth == 0) _standardFontWidth = 7;
(7 was the value I was getting locally so it will do as my default - your mileage may vary) meaning I ended up with
public decimal MaxFontWidth
{
get
{
if (_standardFontWidth == decimal.MinValue)
{
var font = Styles.Fonts[0];
System.Drawing.Font f = new System.Drawing.Font(font.Name, font.Size);
_standardFontWidth=(decimal)(System.Windows.Forms.TextRenderer.MeasureText("00", f).Width - System.Windows.Forms.TextRenderer.MeasureText("0", f).Width);
}
if (_standardFontWidth == 0) _standardFontWidth = 7;
return _standardFontWidth;
}
}
Of course this means building EPPlus from source, and you may have a different value for 7, but its a useful workaround for me!
Related
The question is related to Is there a way of visualising a line in drake visualizer where I had asked about how to visualize a line in the drake visualizer (about 3 years ago, which worked fine with v0.10.0). I am trying to achieve the same with the new API and was wondering if there was any example/documentation which can guide me on how to publish a line onto the visualizer. My previous method used for publishing a line looks like:
void publishLine(const std::vector<std::vector<double>>& pts,
const std::vector<std::string>& path, lcm::DrakeLcm& lcm,
std::vector<double> color) {
long long int now = getUnixTime() * 1000 * 1000;
nlohmann::json j = {{"timestamp", now},
{
"setgeometry",
{{{"path", path},
{"geometry",
{
{"type", "line"},
{"points", pts},
{"color", color},
{"radius", 0.1},
}}}},
},
{"settransform", nlohmann::json({})},
{"delete", nlohmann::json({})}};
auto msg = robotlocomotion::viewer2_comms_t();
msg.utime = now;
msg.format = "treeviewer_json";
msg.format_version_major = 1;
msg.format_version_minor = 0;
msg.data.clear();
for (auto& c : j.dump()) msg.data.push_back(c);
msg.num_bytes = j.dump().size();
// Use channel 0 for remote viewer communications.
lcm.get_lcm_instance()->publish("DIRECTOR_TREE_VIEWER_REQUEST_<0>", &msg);
}
You can use Meshcat::SetLine or Meshcat::SetLineSegments https://drake.mit.edu/doxygen_cxx/classdrake_1_1geometry_1_1_meshcat.html#aa5b082d79e267c040cbd066a11cdcb54
One caveat is that many browsers/webGL implementations do not support the linewidth property in ThreeJS. For thick lines, consider adding a cylinder using SetObject.
Recently upgraded OpenCV from 3.4.5. to OpenCV 4.2.0.
Before I followed this stitching example: https://github.com/opencv/opencv/blob/5131619a1a4d1d3a860b5da431742cc6be945332/samples/cpp/stitching_detailed.cpp (particularly line 480). After upgrading, I altered the code to align more with this newer example: https://github.com/opencv/opencv/blob/master/samples/cpp/stitching_detailed.cpp (Note line 481).
Problem is with this new computeImageFeatures function, I am getting less detected features. Older code with same images gave me 1400+ features but computeImageFeatures gave me exactly 500 features per image. Any ideas how to "fix" this? I believe it also causes the "Bundle Adjuster" to fail later.
According to documentation of cv::ORB::create, default value of nfeatures argument is 500:
The first argument is nfeatures, you may set the first argument to grater number like 2000.
Here are the constructor arguments:
static Ptr<ORB> cv::ORB::create (int nfeatures = 500,
float scaleFactor = 1.2f,
int nlevels = 8,
int edgeThreshold = 31,
int firstLevel = 0,
int WTA_K = 2,
int scoreType = ORB::HARRIS_SCORE,
int patchSize = 31,
int fastThreshold = 20
)
Try modifying:
if (features_type == "orb")
{
finder = ORB::create();
}
to
if (features_type == "orb")
{
finder = ORB::create(2000);
}
In case you are not using ORB, but other type of features, read the documentation of the constructor.
I assume all types has a limiter argument.
I'm developing a google spreadsheet that is automatically requesting information from a site, below is the code. The variable 'tokens' is an array consisting of about 60 different 3 letter unique identifiers. The problem that i have been getting is that the code keeps failing to request all information on the site. Instead it falls back (at random) on the validation part, and fills the array up with "Error!" strings. Sometimes its row 5, then 10-12, then 3, then multiple rows, etc. When i run it in debug mode everythings fine, can't seem to be able to reproduce the problem.
Already tried to place a sleep (100ms) but that fixed nothing. Also looked at the amount of traffic the API accepts (10 requests per second, 1.200 per minute, 100.000 per day) , it shouldn't be a problem.
Runtime is limited so i need it to be as efficient as possible. I'm thinking it is an issue of computational power after i pushed all values in the json request into the 'tokens' array. Is there a way to let the script wait as long as necessary for the changes to be committed?
function newGetOrders() {
var starttime = new Date().getTime().toString();
var refreshTime = new Date();
var tokens = retrieveTopBin();
var sheet = SpreadsheetApp.openById('aaafFzbXXRzSi-eXBu9Xh81Ne2r09vM8rLFkA4fY').getSheetByName("Sheet37");
sheet.getRange('A2:OL101').clear();
for (var i=0; i<tokens.length; i++) {
var request = UrlFetchApp.fetch("https://api.binance.com/api/v1/depth?symbol=" + tokens[i][0] + "BTC", {muteHttpExceptions:true});
var json = JSON.parse(request.getContentText());
tokens[i].push(refreshTime);
Utilities.sleep(100);
for (var k in json.bids) {
tokens[i].push(json.bids[k][0]);
tokens[i].push(json.bids[k][1]);
}
for (var k in json.asks) {
tokens[i].push(json.asks[k][0]);
tokens[i].push(json.asks[k][1]);
}
if (tokens[i].length < 402) {
for (var x=tokens[i].length; x<402; x++) {
tokens[i].push("ERROR!");
}
}
}
sheet.getRange(2, 1, tokens.length, 402).setValues(tokens);
}
I want to make histogram of my data so, I use histogram class at c# using MathNet.Numerics.Statistics.
double[] array = { 2, 2, 5,56,78,97,3,3,5,23,34,67,12,45,65 };
Vector<double> data = Vector<double>.Build.DenseOfArray(array);
int binAmount = 3;
Histogram _currentHistogram = new Histogram(data, binAmount);
How can I get the count of the biggest bin? Or just the index of the bigest bin? I try to get it by using GetBucketOf but to do this I need the element in this bucket :(
Is there any other way to do this? I read the documentation and Google and I can't find anything.
(Hi, I would use a comment for this but i just joined so today and don't yet have 50 reputation to comment!) I just had a look at - http://numerics.mathdotnet.com/api/MathNet.Numerics.Statistics/Histogram.htm. That documentation page (footer says it was built using http://docu.jagregory.com/) shows a public property named Item which returns a Bucket. I'm wondering if that is the property you need to use because the automatically generated documentation states that the Item property "Gets' the n'th bucket" but isn't clear how the Item property acts as an indexer. Looking at your code i would try _currentHistogram.Item[n] first (if that doesn't work try _currentHistogram[n]) where you are iterating the Buckets in the histogram using something like -
var countOfBiggest = -1;
var indexOfBiggest = -1;
for (var n = 0; n < _currentHistogram.BucketCount; n++)
{
if (_currentHistogram.Item[n].Count > countOfBiggest)
{
countOfBiggest = _currentHistogram.Item[n].Count;
indexOfBiggest = n;
}
}
The code above assumes that Histogram uses 0-based and not 1-based indexing.
I've been programming in Java for a while and I decided to try and learn Groovy. I'm going through the project euler problems and one the first problem I've already noticed something strange.
class Problem1
{
public static void main(String[] args)
{
def multiple = 1;
for(i in 1..1001)
{
//if it is divisible by three then multiply is
if(i%3 ==0)
{
multiple = multiple * i;
}
if(i%5 ==0)
{
multiple = multiple * i;
}
holder = multiple
}
println(multiple)
}
}
my value to multiple is being set incorrectly. Everything works as expected inside of the loop but when I try to print my value I get 0. It doesn't even print the 1 that I set the variable to initially. I wouldn't expect this to happen in Java. Why does it happen in Groovy? I thought that groovy was supposed to be like Java under the hood.
You're overflowing an integer (as you would in Java also)
Try using a BigInteger by changing
def multiple = 1;
To
def multiple = 1G