Index exceeds the number of array elements. Index must not exceed 272.

Hi everyone,

I have a problem with my code.

This is my code:

plot_power = [872 1016];

time_power = plot_power(1):bin:plot_power(2);

mean_value_data_smooth_1 = mean_value_data_smooth_1.';

mean_value_data_smooth_2 = mean_value_data_smooth_2.';

spectrum_1 = mean_value_data_smooth_1(time_power);

spectrum_2 = mean_value_data_smooth_2(time_power);

the time power is a vector 1x15, while the spectrum_1 and spectrum_2 are a vectors 272x1.

The error is: Index exceeds the number of array elements. Index must not exceed 272.

I don't understand. How can I resolve this???

Thank you so much

[Torsten]

What is

bin 

?

What is

size(mean_value_data_smooth_1) 

and

size(mean_value_data_smooth_2) 

?

[Felicia DE CAPUA]

bin = 10

Answer 1

[David Hill]

What are you trying to do? You cannot index into mean_value_data_smoth with a value greater than its size (272). You are indexing into it with values from 872 to 1016. If you tell us what you are trying to do, big picture, we might be able to help.

[Felicia DE CAPUA]

I need to try the correlation about spectrum_1 and spectrum_2 bewteen this time series (namely time_power).

Answer 2

[Torsten]

mean_value_data_smooth_1 and mean_value_data_smooth_2 only have 272 elements.

Thus the values of the array elements of "time_power" in the assignments

spectrum_1 = mean_value_data_smooth_1(time_power);
spectrum_2 = mean_value_data_smooth_2(time_power);

must lie between 1 and 272.

But they lie between 872 and 1016 by setting

plot_power = [872 1016];
time_power = plot_power(1):bin:plot_power(2);

This will throw the error that the indices of mean_value_data_smooth_1 and mean_value_data_smooth_2 exceed 272.

[Felicia DE CAPUA]

Okay, how can I resolve this?

[Felicia DE CAPUA]

because also I do this, the problem remain.

plot_power = [1 200];

time_power = plot_power(1):bin:plot_power(2);

mean_value_data_smooth_1 = mean_value_data_smooth_1.';

mean_value_data_smooth_2 = mean_value_data_smooth_2.';

spectrum_1 = mean_value_data_smooth_1(time_power);

spectrum_2 = mean_value_data_smooth_2(time_power);

[Felicia DE CAPUA]

Time is a vector with 15 elements

[Torsten]

Strange question because we don't know nothing about what you try to do with your code.

To make the code work, use

plot_power = [1 272]

If this doesn't make sense concerning the aim of your coding - bad luck.

[Felicia DE CAPUA]

I have to find the correlation about mean_value_data_smooth_1 and 2 between 872 and 1016 (temporal range).

[Torsten]

Then you must find the index range (between 1 and 272) in mean_value_data_smooth_1 and mean_value_data_smooth_2 that corresponds to the time range (between 872 and 1016).

[Felicia DE CAPUA]

exactly :(