Converting a Python code that deals with arrays to MATLAB

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Anas Wheba
Anas Wheba 2022-1-6
回答： Vandit 2023-6-27
Hello Everyone,
I'M working on a spike sotring code in python but When I tried to convert it to MATLAB, the code did not work as expected. please can anyone help me to solve my issue ?
Python Code:
if np.max(tmpW) < max_thresh:
tmpS = np.argmax(tmpW) +i
tmpW = data[tmpS-(sw-offset):tmpS+(sw+offset)]
ss = np.append(ss, tmpS)
wf = np.append(wf, tmpW.reshape(1, sw*2), axis=0)
# Remove duplicates
ind = np.where(np.diff(ss) > 1)[0]
ss = ss[ind]
wf = wf[ind]
Matlab code:
if max(wave_form1)< max_thresh
tmp_samp = find(max(wave_form1))+i
wave_form1 = data(tmp_samp-(spike_window-offset):tmp_samp+(spike_window+offset))
spike_samp=[spike_samp tmp_samp]
wave_from = [wave_form wave_form1]
end
  6 个评论
显示 4更早的评论
Walter Roberson
Walter Roberson 2022-1-13
At the time of the error, what is size(data), and the values tmp_samp, spike_window, and offset ? Also, what are the maximum and minimum values for tmp_samp as you iterate through the loop ?
Yongjian Feng
Yongjian Feng 2022-1-21
Also this line is suspicious:
tmp_samp = find(max(wave_form1))+i
Do you want this instead?
tmp_samp = find(wave_form1 == max(wave_form1))+i

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回答（1 个）

Vandit
Vandit 2023-6-27
Hello,
After assuming that 'wave_form', 'wave_form1', 'spike_samp', 'wave_from', 'max_thresh', 'data, spike_window',' offset', and 'i' are defined correctly in your MATLAB environment, the issue in the MATLAB code lies in the lines:
tmp_samp = find(max(wave_form1)) + i; %Incorrect code
tmp_samp = find(wave_form1 == max(wave_form1)) + i; %Modified code
The reason for changing the above code is to find the indices of the maximum value(s) in 'wave_form1' rather than just the first occurrence. In the original Python code, 'np.argmax(tmpW)' returns the index of the first occurrence of the maximum value in 'tmpW'. However, in MATLAB, using 'find(max(wave_form1))' would only return the index of the first occurrence of the maximum value in 'wave_form1', which may not be the desired behavior.
wave_from = [wave_form wave_form1]; %Incorrect code
wave_form = [wave_form; wave_form1]; %Modified code
The reason for changing the code is to correctly append the 'wave_form1' waveform as a new row to the 'wave_form' matrix. In the original Python code, 'wf' is an array where each row represents a waveform. In the MATLAB code, the equivalent variable is 'wave_form'. To correctly append 'wave_form1' as a new row to 'wave_form', we need to use the semicolon (;) to separate the rows.
Hope this helps.
Thankyou

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