How to set Golang’s log output back to console?
For standard error (the default): log.SetOutput(os.Stderr) For standard output: log.SetOutput(os.Stdout) http://golang.org/src/log/log.go
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How to clear previously echoed items in PHP
<?php ob_start(); echo ‘a’; print ‘b’; // some statement that removes all printed/echoed items ob_end_clean(); echo ‘c’; // the final output is equal to ‘c’, not ‘abc’ ?> Output buffering functions The output buffering functions are also useful in hackery to coerce functions that only print to return strings, ie. <?php ob_start(); var_dump($myVar); $data = … Read more
Angular 2 – How to trigger a method on a child from the parent
I think these might be what you’re looking for: https://angular.io/guide/component-interaction#parent-interacts-with-child-via-local-variable https://angular.io/guide/component-interaction#parent-calls-an-viewchild You can access child properties and methods using local variables within the template or using the @ViewChild decorator in the parent’s component class.
Where does the slf4j log file get saved?
slf4j is only an API. You should have a concrete implementation (for example log4j). This concrete implementation has a config file which tells you where to store the logs. When slf4j catches a log messages with a logger, it is given to an appender which decides what to do with the message. By default, the … Read more
How to display progress of scipy.optimize function?
As mg007 suggested, some of the scipy.optimize routines allow for a callback function (unfortunately leastsq does not permit this at the moment). Below is an example using the “fmin_bfgs” routine where I use a callback function to display the current value of the arguments and the value of the objective function at each iteration. import … Read more
Static (Lexical) Scoping vs Dynamic Scoping (Pseudocode)
With static (lexical) scoping, the structure of the program source code determines what variables you are referring to. With dynamic scoping, the runtime state of the program stack determines what variable you are referring to. This is likely a very unfamiliar concept, since basically every programming language in wide use today (except perhaps emacs lisp) … Read more
How to use python numpy.savetxt to write strings and float number to an ASCII file?
You have to specify the format (fmt) of you data in savetxt, in this case as a string (%s): num.savetxt(‘test.txt’, DAT, delimiter=” “, fmt=”%s”) The default format is a float, that is the reason it was expecting a float instead of a string and explains the error message.
Redirecting command output in docker
When you specify a JSON list as CMD in a Dockerfile, it will not be executed in a shell, so the usual shell functions, like stdout and stderr redirection, won’t work. From the documentation: The exec form is parsed as a JSON array, which means that you must use double-quotes (“) around words not single-quotes … Read more
Suppress console output in PowerShell
Try redirecting the output to Out-Null. Like so: $key = & ‘gpg’ –decrypt “secret.gpg” –quiet –no-verbose | out-null