Limits must be a 2-element vector of increasing durations.

Question

Abdur Raziq khan 2021-1-14

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/716593-limits-must-be-a-2-element-vector-of-increasing-durations

评论： Cris LaPierre 2022-6-22

%% question1 part(a)
load handel.mat
filename = 'handel.wav';
audiowrite('handel.wav',y,Fs)
clear y Fs
info = audioinfo('handel.wav')
[y,Fs] = audioread('handel.wav');
%sound(y,Fs);
t = 0:seconds(1/Fs):seconds(info.Duration);
t = t(1:end-1);
plot(t,y)
xlabel('Time-sec')
ylabel('Amplitude')
%% question1 part(b)
amplitudes = abs(y);   % abs(a) is the amplitudes in an all-positive sense
mp = max(abs(y));        % max  is the highest amplitude.
L=8;
dyn_range_of_interval = 2*mp/L;
thresholds 	=  linspace(-(mp-dyn_range_of_interval),(mp-dyn_range_of_interval),L-1);
Temp_vector = [-mp  thresholds  mp]; 
for  k=1:length(Temp_vector)-1
codebook(k) = (Temp_vector(k)+Temp_vector(k+1))/2; end
[index,quants] = quantiz(y,thresholds,codebook);
plot(t,y,'x',t,quants,'.')
legend('Original signal','Quantized signal');
xlim([0.2 0.4])

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Abdur Raziq khan 2021-1-14

Error using xlim (line 31)

Limits must be a 2-element vector of increasing durations.

Error in task1 (line 33)

xlim([0.2 0.4])

Abdur Raziq khan 2021-1-14

I take two element vector of increaning duration but gives me error?

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Answer 1

Cris LaPierre 2021-1-15

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/716593-limits-must-be-a-2-element-vector-of-increasing-durations#answer_598390

编辑：Cris LaPierre 2021-1-16

在 MATLAB Online 中打开

You are plotting a variable of data type duration as x. Therefore, your axis is made up of durtions. The xlim values you use must also be of datatype duration. You use seconds to create t, so do the same for xlim.

%% question1 part(a)

load handel.mat

t = 0:seconds(1/Fs):seconds(length(y)/Fs);

t = t(1:end-1);

plot(t,y)

xlabel('Time-sec')

ylabel('Amplitude')

%% question1 part(b)

amplitudes = abs(y); % abs(a) is the amplitudes in an all-positive sense

mp = max(abs(y)); % max is the highest amplitude.

L=8;

dyn_range_of_interval = 2*mp/L;

thresholds = linspace(-(mp-dyn_range_of_interval),(mp-dyn_range_of_interval),L-1);

Temp_vector = [-mp thresholds mp];

for k=1:length(Temp_vector)-1

codebook(k) = (Temp_vector(k)+Temp_vector(k+1))/2;

end

[index,quants] = quantiz(y,thresholds,codebook);

plot(t,y,'x',t,quants,'.')

legend('Original signal','Quantized signal');

xlim(seconds([0.2 0.4]))

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Kosta Manser 2022-6-22

I have been trying to use the xlim(seconds([start end])) in a subplot but it does not wok in that scenario. The xlimits are not enforced and no error is given.