error Unrecognized function or variable help me please :(!
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the question(the part i tried to solve):
Write a function called PlotSignal, the function will display on a graph the signal it receives.
1.1. The function inputs are:
1.1.1 signalsCell – an object of cell array type, (each pair of rows in it represents one letter, see details
At the end of the question(
1.1.2 n – the number of the signal to be displayed
1.2. The function does not return any value.
1.3. The letter n from the array of cells should be displayed on a graph according to the following detail:
1.3.1. The signal color shall be black.
as you see i have an error in my code i dont know how to load the input in the workspace i tried to do
function PlotSignal(signalsCell, n)
signalsCell=signals(2*n-1:2*n,:);
Y=cell2mat(signalsCell);
X=signals(n,:);
figure;
plot(X,Y,'k');
end
the eroor
Unrecognized function or variable 'signalsCell'.
can someone please help me ? even to write all over again the function please?
thanks !
댓글 수: 11
Stephen23
2024년 2월 9일
How are you calling the function?
My guess is that you are calling it something like this:
PlotSignal(signalsCell, n)
In which case... what value/s do you expect signalsCell to have?
Please show us exactly how you define its input arrays, and exactly how you call this function.
Torsten
2024년 2월 9일
function PlotSignal(signalsCell, n)
signalsCell=signals(2*n-1:2*n,:);
"signalsCell" is the input to your function "PlotSignal" and you overwrite it by "signals(2*n-1:2*n,:)". This must be wrong.
Time
2024년 2월 10일
Stephen23
2024년 2월 10일
"And what do you mean by overwrite ? How do I fix it ?"
What you are doing, overwriting the input argument SIAGNALSCELL and not definiing SIGNALS anywhere:
function PlotSignal(signalsCell, n)
signalsCell=signals(2*n-1:2*n,:);
What you probably intended to do:
function PlotSignal(signals,n)
signalsCell = signals(2*n-1:2*n,:);
Time
2024년 2월 10일
Stephen23
2024년 2월 10일
"But in the question they tell me the input need to be "signalscell" ."
Sure, is there something stopping you from changing the variable names youself?
Time
2024년 2월 10일
tal
2024년 2월 10일
here:)
Stephen23
2024년 2월 10일
And also show us how you call the function.
tal
2024년 2월 10일
n=3;
load('signals.mat','signals')
PlotSignal(signals,n);
답변 (3개)
signalsCell=load('signals').signals;
PlotSignal(signalsCell, 3)
function PlotSignal(signalsCell, n)
Headings=signalsCell(:,1);
Table=cell2table(signalsCell(:,2:end)');
plot(Table, 2*n-1,2*n,Color='k');
xlabel(Headings{2*n-1});
ylabel(Headings{2*n});
end
Perhaps as follows?
signalsCell=load('signals').signals;
PlotSignal(signalsCell, 3)
function PlotSignal(signalsCell, n)
signalsCell=num2cell(cell2mat(signalsCell(:,2:end)),2);
X=signalsCell(1:2:end);
Y=signalsCell(2:2:end);
figure;
plot(X{n},Y{n},'o-k');
end
That really is very bad data design: one single numeric array would be much better than storing lots of numeric scalars in a huge cell array. Your tutor tried to replicate something like a TABLE... but should just use a TABLE. You will have to unlearn half of what they show you :(
signals = load('signals.mat').signals
PlotSignal(signals,1)
PlotSignal(signals,3)
function PlotSignal(inp,n)
sig = "y"+n;
idx = find(strcmpi(sig,inp(:,1)));
X = cell2mat(inp(idx-1,2:end));
Y = cell2mat(inp(idx-0,2:end));
plot(X,Y,'+-k');
legend(sig)
end
댓글 수: 11
tal
2024년 2월 10일
thank you so much for your help ! i really appriciate it . do the way i wrote the function it isnt corect at all ?
"do the way i wrote the function it isnt corect at all ?"
It works when you fix the bugs and call it correctly. For example:
signals = load('signals.mat').signals;
PlotSignal(signals,3)
function PlotSignal(signalsCell, n)
X = cell2mat(signalsCell(2*n-1,2:end));
Y = cell2mat(signalsCell(2*n-0,2:end));
plot(X,Y,'k');
end
Time
2024년 2월 13일
Walter Roberson
2024년 2월 13일
You would get an error in the second line if you pressed the green Run button to execute the code. When you press the green Run button to execute the code, it executes the function with no input parameters.
You need to go down to the command line and
signals = load('signals.mat').signals;
PlotSignal(signals,3)
Time
2024년 2월 13일
편집: Walter Roberson
2024년 2월 13일
Walter Roberson
2024년 2월 13일
What is the error message?
Time
2024년 2월 13일
Walter Roberson
2024년 2월 13일
As a test, add a whos command near the top,
function PlotSignal(signalsCell, n)
whos
X=signalsCell(2*n-1,2*n);
Y = cell2mat(signalsCell(2:end));
figure;
plot(X,Y,'k');
end
and see what the result is
Time
2024년 2월 13일
@Time: However, if I modify the function as suggested by Stephen, it runs fine:
n=3;
load('signals.mat','signals')
PlotSignal(signals,n);
function PlotSignal(signalsCell, n)
X = cell2mat(signalsCell(2*n-1,2:end));
Y = cell2mat(signalsCell(2*n-0,2:end));
plot(X,Y,'k');
end
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