how to load .txt data into a function and use it as variables in matlab function

Hi All,

I would like to use my out source data (in .txt), into finding a graph. The data is b = a070_edit(:,1) are an variables that are varies along the frquecy range. The 'b' data will be used as an varible in a function to find an unknown 'a'. and then a graph will be plotted (f vs a).

Actually my equation is much more complicated. Thus below I use a simple equation, so that it will be easier to solve the problem.

function 
load a070_edit.txt % list of data from outsource
b = a070_edit(:,1) 
d = 1;
t = 5./b;
f = 50:1.5625:5600;
w = 2.*pi.*f;
a = (d./t).*w
plot (f,a)
end

Kindly, please help me to load and use an external data into matlab function.

Your help will be appreciated.

Thank you.

Regards,

Nur Arafah

Answer 1

[madhan ravi]

B % just call it

function B % not if the file is input from outside the function then parameterize you function by providing an input for it
load a070_edit.txt % list of data from outsource
b = a070_edit(:,1); 
d = 1;
t = 5./b;
f = 50:1.5625:5600;
w = 2.*pi.*f;
a = (d./t).*w;
plot(f,a)
end

[Jafar Nur Arafah]

Dear madhan ravi,

Thank for your help.

The code works but the graph is not as what I'm expecting.

As 'b' is a parameter depending on f (which means each 'b' is for each 'f'). Thus, I'm expecting the graph to be 1 line only connecting each calculated value of 'a'.

I'm not very sure the 'data' is from where. Please correct me if i'm wrong.

P/S: the total value of 'b' attached is only about 10. But there are total of 3552 b's (which match with f = 50:1.5625:5600.

Tq.

[madhan ravi]

b has 10 values , f has 3553 values

[Jafar Nur Arafah]

Hi madhan,

The problem solved.

Thanks alot.

=)