Can anyone tell me how to compare this for loop array value pp1 with the single value of pp. If the value of pp is present in pp1 then it must show 1 or must show 0. I'm getting 1 only the last value of pp1. The code is:
[pp,pf1]=pitchauto(x,fs);
for ix=1:2
V='.wav';
ie=num2str(ix);
Stc=strcat(ie,V);
[x1,fs1]=wavread(Stc);
figure,plot(x1);
title('Test Audio');
[pp1,pf1]=pitchauto(x1,fs1);
end
if (pp==pp1)
msgbox('Matching');
else
msgbox('Not Matching');
end
Kindly do reply with the correct answers.
You calculate a value for pp1 each time, do nothing with it, then let the next loop iteration overwrite it. To make use of it, either put the test inside the loop:
for ix=1:2
V='.wav';
ie=num2str(ix);
Stc=strcat(ie,V);
[x1,fs1]=wavread(Stc);
figure,plot(x1);
title('Test Audio');
[pp1,pf1]=pitchauto(x1,fs1);
if (pp==pp1)
msgbox('Matching', num2str(ix)); % show the index number as msgbox title
else
msgbox('Not Matching', num2str(ix));
end
end
or collect the values of pp1 in an array to test afterwards:
for ix=1:2
V='.wav';
ie=num2str(ix);
Stc=strcat(ie,V);
[x1,fs1]=wavread(Stc);
figure,plot(x1);
title('Test Audio');
[pp1(ix),pf1]=pitchauto(x1,fs1); % assuming pitchauto returns a scalar
end
matchidx = (pp == pp1);
if any(matchidx)
msgbox(strcat('Matching indices: ', num2str(find(matchidx))));
else
msgbox('Not Matching');
end
If the values aren't scalar, then this approach is a bit more difficult - you could still use a matrix to collect equal-sized vectors, or a cell array to collect anything - but it's probably easier to stick with the first approach in that case.
Related
I have a Matlab function which returns an array with probability alpha and nothing (i.e. an empty array) with probability 1-alpha:
function [binary_array_e1 , binary_array_e2 ] = croiser(binary_array_p1,binary_array_p2,alpha )
binary_array_e1=[];
binary_array_e2=[];
compt=1;
if (rand <= alpha)
% some stuff that will put sth in binary_array_e1 and binary_array_e2
end
My question is: how should I manage the fact that the function could return empty arrays at the call of the function? Is something like:
[binary_array_e1 , binary_array_e2]=croiser(binary_array_p1,binary_array_p2,alpha);
be sufficient?
If you want to return an empty variable from a function call, you are totally allowed to do it and you are on the right path. Initialize your variables as empty at the beginning of the function...
function [binary_array_e1 , binary_array_e2 ] = croiser(binary_array_p1,binary_array_p2,alpha )
binary_array_e1=[];
binary_array_e2=[];
% ...
end
and then just check the outcome whenever you need to do it, for example:
[binary_array_e1,binary_array_e2] = croiser(binary_array_p1,binary_array_p2,alpha);
if (isempty(binary_array_e1))
% do something 1...
elseif (isempty(binary_array_e2))
% do something 2...
else
% do something 3...
end
Of course, in order to check the outcome, both variables must be returned and evaluated. But if you are returning two empty arrays in one case and two non-empty arrays in the other case, you could also check only one array:
if (isempty(binary_array_e1))
% do something...
else
% do something else...
end
Anyway... there are so many ways to obtain the same result. For example, you could also return a 'logical' variable that tells you immediately if your arrays have been filled with something or not, or you could return a 'struct' filled with your data in order to make everything more compact (I can elaborate on these solutions if you want). It's up to you but I see nothing wrong in your approach!
Yes, that should be fine. You can later check if the output is an empty array using the function isempty
I want to use structure in matlab but in first iteration it's run correctly and in other iteration give that message .
1x2 struct array with fields:
my code is :
for i=1:lenfd
currow=rees(i,:)
maxcn=max(currow)
if maxcn~=0
maxin=find(currow==maxcn)
ress(i).x =maxin
end
end
thank you.
That message is not a warning or error. That's just MATLAB printing the output of an operation. And it does that by default, unless you suppress it by appending a semicolon to the command:
for ii = 1:lenfd
currow = rees(ii,:); % <=== NOTE: semicolons at the end
maxcn = max(currow);
if maxcn ~= 0
ress(ii).x = find(currow==maxcn);
end
end
Note that max() may have 2 outputs, the second output being the first index into the array where the maximum occurred. If you know beforehand that any maximum will occur only once, you can skip the call to find() and use the second output of max().
In Matlab, in order to change the value of a block I do
set_param('model/V','Amplitude','100')
and the value of V is 100. But if I do
for i=1:10
set_param('model/V','Amplitude','P(i)')
...
end
The it stores the value of V as P(i). But in order to access the i-th element of the 20-by-1 P matrix, I need to refer to it by P(i). What is my error?
Change the value to string using:-
set_param('model/V','Amplitude',num2str(P(i)) );
Also it will set the value of 'model/V' to P(20) i.e. last one.
You might want to loop through the current blocks too
Something like : (just example)
set_param(['model/V' num2str(i)],'Amplitude',num2str(P(i)) );
for model/V1, model/V2,...model/V20 .
Here is the thing:
I have while loop nested in a for loop.
I can get the results of each iteration as a result for the variable flp. But now i want all these results stored in a vector with same number of rows as another variable called eci. I'm aware that i have to preallocate the vector. But how do i move on from here?
Tank you!
Here is the code i've done so far:
for eci=0:0.0002:ecu
fl=0;
fcc=fc0*(2.254*sqrt(1+7.94*fl/fc0)-2*fl/fc0-1.254);
ecc=ec0*(1+5*(fcc/fc0-1));
r=Ec/(Ec-fcc/ecc);
x=eci/ecc;
fc=fcc*x*r/(r-1+x^r);
el=(Ec*eci-fc)/(2*beta*fc);
flp=ke*kr*2*nf*tf*Ef*1000*el/B;
while abs(fl-flp)>0.0001
fl=flp;
fcc=fc0*(2.254*sqrt(1+7.94*fl/fc0)-2*fl/fc0-1.254);
ecc=ec0*(1+5*(fcc/fc0-1));
r=Ec/(Ec-fcc/ecc);
x=eci/ecc;
fc=fcc*x*r/(r-1+x^r);
el=(Ec*eci-fc)/(2*beta*fc);
flp=ke*kr*2*nf*tf*Ef*1000*el/B
end
end
eci=[0:0.0002:ecu]';
m=size(eci);
m(:,2)=[];
mat_result=zeros(m,1)
Its quite stimple, start with an empty vector, for example:
results = zeros(length(0:0.0002:ecu),1);
Then just start counting with t=t+1 somewhere in the loop (initialize properly ofcourse) and store the restult:
results(t) = myResult
In my program , suppose I fix no. of users N=6 .
Threshold value of SIR SIRo=6; Output generated is SIRmean=10 (suppose).
I want to make a loop so that
if SIRmean < SIRo
disp N=6
else
decrease the counter till SIRmean> SIRo
and display the value of N for which this condition holds true.
end
You can use simple for loop with downcounter and break on condition:
N=6;
for k=N:-1:0
SIRmean = calc_SIR_mean(N);
if SIRmean < SIRo
disp(['N=' k])
break;
end
end
Function calc_SIR_mean should return mean value based on number of users (it is not clear from your question how you receive this value).