measurement

Due to security limitations at work, I am not allowed to install Chrome extensions. Chrome has a ruler built in to the developer tools, but I can't figure out how to define start and end points like a ruler would permit. Are there any tools or techniques for measuring pixels that don't require installing a Chrome extension? Matt Zeunert You could create your own ruler functionality and paste it into the console. Here's a basic example: var fromX, fromY; var svg = document.createElementNS ('http://www.w3.org/2000/svg',"svg"); svg.setAttribute("style", "position: absolute; top:0;left:0;height: "

I am using OpenCV for an optical measurement system. I need to carry out a perspective transformation between two images, captured by a digital camera. In the field of view of the camera I placed a set of markers (which lie in a common plane), which I use as corresponding points in both images. Using the markers' positions I can calculate the homography matrix. The problem is, that the measured object, whose images I actually want to transform is positioned in a small distance from the markers and in parallel to the markers' plane. I can measure this distance. My question is, how to take that

How can I go about getting a program's running time through system time functions in Haskell? I would like to measure the execution time of a whole program and/or an individual function. Assuming you don't just want to measure the total running time of your program, like so: $ time ./A Then you can time a computation a number of ways in Haskell: Basic timing (e.g. as in the timeit package ) Timing in cycles For more statistically sound measurement, consider The Criterion package . Finally, in all cases, you need to think about lazy evaluation: do you want to measure the cost of fully

I have a potentially long-running test written with scalatest : test("a long running test") { failAfter(Span(60, Seconds)) { // ... } } Even if the test finishes within the timeout limit, its running time can be valuable to the person who runs the test. How can I measure and display the running time of this single particular test in scalatest's output? Update: Currently I measure the running time with my own function, just as in r.v's answer. I'd like to know if scalatest offers this functionality already. the -oD option will give the duration of the test. For example, I use the following in

Is there any way to measure a specific process CPU usage by cores? I know top is good for measuring the whole system's CPU usage by cores and taskset can provide information about which CPU core is allowed for the process to run on. But how do I measure a specific process' CPU usage by CPU cores? abdollar You can still do this in top . While top is running, press '1' on your keyboard, it will then show CPU usage per core. Limit the processes shown by having that specific process run under a specific user account and use Type 'u' to limit to that user You can use: mpstat -P ALL 1 It shows how

This post replies very well to the question "How to get Advertising ID in android?"... but not how to use it. I would like to know what is the parameter to be used in the Google Measurement Protocol to transfer that advertising ID the Google endpoint and get demographic insights in my GA dashboards (on https://analytics.google.com/ ). Do I have to send it with the client id ("cid")? Or, to make it simple, what is the parameter used by the SDK on iOS and Android? If anyone is looking for this answer the parameter is &adid for android (&idfa for iOS). You also apparently have to send the store

I was getting a little confused with the representation of different units of bytes. It is accepted throughout that 1 byte = 8 bits. However, in a lot of sources I have seen that 1 kiloByte = 2^10 bytes = 1024 bytes AND 1 kiloByte = 1000 bytes Doesn't this contradict as in both cases it is stated that 1 byte is 8 bits...? Different sources claim different reasons for these different representations, thus I am not sure what the most important/real reason is for this rather confusing difference in representation. Can someone please explain and clarify? It is accepted throughout that 1 byte = 8

This is the "algorithm", but when I want to measure the execution time it gives me zero. Why? #define ARRAY_SIZE 10000 ... clock_t start, end; start = clock(); for( i = 0; i < ARRAY_SIZE; i++) { non_parallel[i] = vec[i] * vec[i]; } end = clock(); printf( "Number of seconds: %f\n", (end-start)/(double)CLOCKS_PER_SEC ); So What should i do to measure the time? Two things: 10000 is not a lot on a modern computer. Therefore that loop will run in probably less than a millisecond - less than the precision of clock() . Therefore it will return zero. If you aren't using the result of non_parallel its