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问题 Our project is to integrate Lidar system into virtual reality (unity). I could achieve that integration with ROS-bridge. Next step is to process the point cloud data before we send it to unity system. Lidar sensor velodyne VLP-16 Ubuntu 18.4 IDE: Pycharm (python) Point cloud processing: python point cloud library with ROS ros-bridge with unity system Problem Without processing, there is only 1 second latency from sensor to unity visualization. But processing point-cloud data in ROS(pycharm)

问题 Now I have a dict object, where the key is a unique hashed id and the value is a length > 100 sparse list. I'd like to store this in plain text(e.g., csv/tsv/whatever that is not pickle.dump). Is there any good way to store this kind of sparse list? For example: d = {"a": [0,0,0, ..., 1,0], "b": [0.5,0,0, ...,0.5,0], "c":...} The length of each list is exactly the same. I was thinking whether it's worth storing this kind of sparse list as index-value pair. But I'm not sure whether there is

问题 I need to generate css based on sass variables. How to turn this: $themes: ( light: ( text: black ), dark: ( text: white ) ); .foo { display: flex; color: @include themify('text'); } Into this: .foo { display: flex; } .light .foo { color: #000; } .dark .foo { color: #fff; } Any ideas of how to implement this? 回答1: You can't reuse the color declaration using a mixin, so instead, you need to pass it to the mixin. Check that out $themes: ( light: ( text: black ), dark: ( text: white ) ); @mixin

问题 I have an xml that contains two groups of related values: <Rows> <!-- first group --> <Row> <Sequence>100</Sequence> <Value>+</Value> </Row> <Row> <Sequence>105</Sequence> <Value>+</Value> </Row> <Row> <Sequence>110</Sequence> <Value>-</Value> </Row> <!-- second group --> <Row> <Sequence>150</Sequence> <Value>20</Value> </Row> <Row> <Sequence>155</Sequence> <Value>15</Value> </Row> <Row> <Sequence>160</Sequence> <Value>90</Value> </Row> </Rows> Each element of 1st group related to an element

问题 I have a chart containing 3 LineSeries. Sometimes, the lines cross each other. At these points only the single tooltip of the last added series is displayed. How can I combine those tooltips into one single single tooltip that contains the information on all three series, in case the points are at the same position? I build the chart using LineSeries and place CircleBullets on them: /* Create series */ var series1 = chart.series.push(new am4charts.LineSeries()); series1.dataFields.valueY =

问题 I need to generate css based on sass variables. How to turn this: $themes: ( light: ( text: black ), dark: ( text: white ) ); .foo { display: flex; color: @include themify('text'); } Into this: .foo { display: flex; } .light .foo { color: #000; } .dark .foo { color: #fff; } Any ideas of how to implement this? 回答1: You can't reuse the color declaration using a mixin, so instead, you need to pass it to the mixin. Check that out $themes: ( light: ( text: black ), dark: ( text: white ) ); @mixin

问题 I want to copy all the non-empty cells in columns A/B from sheet "Consolidation Sheet" and then paste these cells into the sheet "Inputs for Web App" into columns H:I (always starting from the top, rather than appending them as new rows, since these values will be updated constantly). Then I basically want to drag down all of the formulas in the other columns (A through G) all the way down to the last row pasted. Format column I as a date. I'm not sure if I need a loop to do this or just an

问题 I'm trying to write a program that connects via SSH to a remote Linux server using Java. I've found a number of examples online to do this using the JSch package, but they're mostly for issuing a single command to the server right after authentication. Is there any way, however, to first authenticate with the SSH server, then, over the connection, issue commands from the user input like you would via a remote shell? 回答1: If you want to implement an interactive shell, you need to use SSH

问题 This question already has answers here : How to skip or ignore python decorators (3 answers) Closed 4 years ago . I have a decorator @auth which basically checks a database to ensure a user can access a given REST call. I would like to write some unit tests for these calls. My initial idea was to simply monkeypatch the decorator into a pass through that does nothing. (My initial idea failed, so I may just monkeypatch some function inside of @auth so that it always passes, but I'm still

问题 I have a list of data frames which I reshuffle and then I want to save the output as a csv. To do this I'm trying to append this list to an empty data frame: l1=[year1, year2,..., year30] shuffle (l1) columns=['year', 'day', 'tmin', 'tmax', 'pcp'] index=np.arange(10957) df2=pd.DataFrame(columns=columns, index=index) l1.append(df2) This result in an empty data frames with a bunch of Nans. I don't necessarily need to append my reshuffled list to a dataframe, I just need to save it as a csv, and