convert signal curve into straight line

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Evan Weking
Evan Weking 2016-11-22
回答： Walter Roberson 2016-11-22
hello everyone
i want to ask something
i have signal plot like this
from this plot, i want to convert the curve into straight line with this formula : 1/√f
here is my code :
global X;
global R;
R = plot(B, A);
X = gca;
global freq;
global point;
X.Scale = 'log';
int X p1 p2;
double( 'froot(116)' )
freq('116')
val('116')
point('116');
double val1 val2; result; %#ok<VUNUS,NODEF>
for X = 0
X < 116 -1; %#ok
for R = 0 : 116 -1;
froot(X) = 8e-3 + (100e-3)/116.0*X; %#ok<AGROW>
freq(X) = (1.0/froot(X))*(1.0/froot(X));
point(X) = 116.0*freq(X)/20000.0; %#ok<AGROW>
p1 = trunc(int(point(X)));
p2 = p1+1;
val1 = val(p1);
val2 = val(p2);
result = val1+(val2-val1)/(p2-p1)*(point(X)-p1); %#ok<NASGU>
end
end
guidata(hObject,handles);
axes(handles.axes3); %#ok
plot(R);
msgbox('Transform SUCCESSFUL !');
please tell me if my code is wrong or not.
thanks
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Evan Weking
Evan Weking 2016-11-22
sorry about that,
this is my data for the program
i'm really sorry for before, thanks

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回答（1 个）

Walter Roberson
Walter Roberson 2016-11-22
int X p1 p2;
in MATLAB means the same as
int('X', 'p1', 'p2')
which would attempt to find a function int that took character strings as input. It probably would not find one.
double( 'froot(116)' )
means to take the string 'froot(116)' and convert each character into its numeric encoding, such as 'f' being character #102. Then, the result of that conversion would be displayed because there is no semi-colon on the end of the line.
double val1 val2; result; %#ok<VUNUS,NODEF>
would be the same as
double('val', 'val2');
result;
which would get you an error message because double() only expects on argument.
freq('116')
would attempt to index the variable freq at [49, 49, 54] and display the result.
All in all, I think it likely that your code is in error. It appears that you attempted to convert from some other programming language.

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