Is there an easy way to apply a low-pass or high-pass filter to an array in MATLAB? I'm a bit overwhelmed by MATLAB's power (or the complexity of mathematics?) and need an easy function or some guidance as I couldn't figure it out from the documentation or searching the web.
nbro
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ChristianChristian
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2 Answers
Look at the
filter function.
If you just need a 1-pole low-pass filter, it's
where a = T/τ, T = the time between samples, and τ (tau) is the filter time constant.
Here's the corresponding high-pass filter:
If you need to design a filter, and have a license for the Signal Processing Toolbox, there's a bunch of functions, look at fvtool and fdatool.
nbro
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Jason SJason S
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You can design a lowpass Butterworth filter in runtime, using
butter() function, and then apply that to the signal.
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Highpass and bandpass filters are also possible with this method. See https://www.mathworks.com/help/signal/ref/butter.html
AhmadAhmad
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I want to submit search query form & get search result without redirecting/reloading/refreshing on the same page.
My content is dynamic so can not use those 'submit contact form without refreshing page which replies back on success'.
Gary
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MANnDAaRMANnDAaR
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4 Answers
In order to submit a form, collect the results from the database and present them to the user without a page refresh, redirect or reloading, you need to:
So, having said that, here's an working example:
We have a table 'persons' with a field 'age' and a field 'name' and we are going to search for persons with an age of 32. Next we will present their names and age inside a
div with a table with pink background and a very large text.To properly test this, we will have an header, body and footer with gray colors!
index.php
db_query.php
The controlling stuff depends from what you want, but use that code, place those two files in the same directory, and you should be fine!
Any problems or a more explicative code, please let us know ;)
ZuulZuul
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You'll probably want to start with any of the thousands of 'AJAX for beginners' tutorials you can find on the net. A Google search with that term should get you going.
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Try this for starters:
After you've read through that, keep in mind that you really don't need to be writing any XHR handling code. As pointed out by Jamie, jQuery or any of the other multitudes of Javascript libraries out there, can greatly simplify your client-side AJAX code.
desaudesau
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This is what AJAX is for.In jQuery (apologies if you're looking for a different library)
Jamie WongJamie Wong
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It's good if you can get some basics of Ajax before straight away going to the code. Ajax , is the exact solution for your problem. It asynchronously makes a request to the server, get the result and the data in the page can be modified with the result . It's all done in JavaScript.
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Suppose you have an html like this:
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Now, your javascipr code will be like this:
so, basically upon click of the button, the JavaScript will be executed. It wil call the php serverside script, pass the parameters it got from user input and retrieve the response data and place it inside the div.So your page is updated without full refresh.
Also, please understand that, i used jquery library here for the Ajax function.
Wind ChimezWind Chimez
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