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Filtering the values of current and voltages based on a criteria

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Ganesh Kini
Ganesh Kini on 12 Mar 2020
Commented: Ameer Hamza on 3 Apr 2020
I have a list of 1000000 sets of data in a .mat file. it has 5 columns, say A,B,C, Current and voltage. for many sets of data we would be having same current and voltages values. I need to read the file and then I need to filter out and get the values of current and voltage as output based on some condition. How do i do it ? I'm new to matlab. kindly help
The data looks something like this
A B C current voltage
.1 0.33 .99 1 1
0.2 0.34 .100 1 2
0.3 0.35 .101 1 3
0.4 0.36 .102 1 1
0.5 0.37 .103 2 3
0.6 0.38 .104 2 6
0.7 0.39 .105 2 8
0.8 0.40 .106 3 3
0.9 0.41 .107 3.5 3
0.10 0.42 .108 3 3.5
0.11 0.43 .109 3 0
0.12 0.44 .110 3 3.5
0.13 0.45 .111 3.5 0
0.14 0.46 .112 3.5 6
0.15 0.47 .113 3.5 7
How do i print the values of current and voltage by reading each data based on some condition ( condition is not related to current or voltage ) .The condition is with respect to time, and not A,B, C
PS: reading the file is done, I'm getting the proper output. only filtering part is left

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Answers (1)

Ameer Hamza
Ameer Hamza on 12 Mar 2020
Suppose you have two linear arrays named current and voltage, you can filter them based on a condition as follow.
mask = current > voltage;
current = current(mask);
voltage = voltage(mask);
It filters all values where current is greater than voltage.

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Ganesh Kini
Ganesh Kini on 3 Apr 2020
A BC current voltage time
.1 0.33 .99 1 1 1ns
0.2 0.34 .100 1 2 1ns
0.3 0.35 .101 1 3 1ns
0.4 0.36 .102 1 1 2ns
0.5 0.37 .103 2 3 2ns
0.6 0.38 .104 2 6 1ns
0.7 0.39 .105 2 8 3ns
0.8 0.40 .106 3 3 3ns
0.9 0.41 .107 3.5 3 3ns
This an example how it looks. So for time 1 ns i want all the values of current and voltage
but the above matrix is stored in a .mat file.
I need to access the variables by loading the file and then extracting the current and voltage value based on time = 1ns condition
Please let me know
Ameer Hamza
Ameer Hamza on 3 Apr 2020
load('filename.mat'); % write your filename
mask = time == 1;
filtered_current = current(mask);
filtered_voltage = voltage(mask);

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