Passing a file by function

I am trying to send a file by function. I have two functions. The contents are as follows :

%%%SNR.m %%%%
%main 
clear all
clc

noise_vec=0.5;
power_subch=[1 1 1 1 1 1 1 1 1 1 ];
H_k=randn(1,10);
Nof_Subcarriers=10;
aver_power=1;


sFileName = 'new.txt';
fid = fopen(sFileName,'wt');
gSNR=Gav(noise_vec, power_subch,aver_power, H_k,Nof_Subcarriers,fid)
fprintf(fid,'%f\n',gSNR);

func2(sFileName);

In this file I am calculating a value gSNR storing it and passing it to another file called func2.m

function func2(filenames)
headerLength=1;
numColumns=1;
fid = fopen(filenames ,'wt');
data = textscan(fid, repmat('%f',1,numColumns), 'headerlines', headerLength);


end

However there are are errors such as unable to read any data from file. TEXTSCAN might not have read access.

error in line : data = textscan(fid, repmat('%f',1,numColumns), 'headerlines', headerLength);

and in line : func2(sFileName);

I am not sure how to address these errors, have tried a lot.

Answer 1

[Walter Roberson]

fid = fopen(filenames ,'wt');

You opened the file for writing, but you immediately try to read it.

Note that you fail to close the file after.