Variable output as "1x0 empty double row vector" halfway through the program after previous iterations in the for loop has normal output values for the same variables.

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David Rosenbaum
David Rosenbaum 2023-5-9
移动：Torsten 2023-5-9
Ran in:
Why am I getting 1x0 empty double row vectors for the last several iterations of the variables Peaks and X_Peak_value? The output seems to produce values for these variables up to a point and then the output only displays "1x0 empty double row vector".
Here is my code...
clear all;clc
Data = InputData('CJ1');
Unrecognized function or variable 'InputData'.
for i = 1:1:90
for x = 1:1:900
vel = 0;
vel = vel + 1*x;
alt = 0;
alt = alt + 500*i;
R = aerodynamics(vel, alt,Data);
V(x) = vel;
RC(x) = R.RC;
end
[Peaks, X_Peak_value] = findpeaks(RC, V)
ROC_max(i)= Peaks;
Vel_max_ROC(i) = X_Peak_value;
end
plot(Vel_max_ROC, ROC_max)

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回答（2 个）

Cris LaPierre
Cris LaPierre 2023-5-9
We can't run your code to explore why specifically, but my guess is that they are empty because findpeaks did not identify any peaks in your input RC.
Torsten
Torsten 2023-5-9
移动：Torsten 2023-5-9
Ran in:
It may happen that no peaks can be found:
RC = 1:4;
V = 1:4;
[Peaks, X_Peak_value] = findpeaks(RC, V)
Peaks = 1×0 empty double row vector X_Peak_value = 1×0 empty double row vector

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