Peak Between Different Peak Values

Am trying to get these two peaks once I read from my text file. I have defined two string to compare two value in order to find the peak, but I think my if(y_0>MP) statement is

Solution 1:

Your suspicions about the if (y_0 > MP) line are correct. If you want to make a toast showing the number of peaks found, then you either need to keep a list of the peaks, or a counter, and add to it every time a peak is found. Then, after the for-loop has finished searching for peaks, you would make a toast saying how many peaks were found.

List<Integer> peaks = new ArrayList<>();
for (t = 1; t < dataArray.length - 1; t++) {
    float y_0 = Float.valueOf(dataArray[t]);
    float y_1 = Float.valueOf(dataArray[t + 1]);
    float y_2 = Float.valueOf(dataArray[t - 1]);

    float left = y_0 - y_2;
    float right = y_1 - y_0;

    if (left > 0 && right < 0)
        peaks.add(t);
}

Toast.makeText(getApplicationContext(), "Number of peaks founds\n: " + peaks.size(), Toast.LENGTH_SHORT).show();

for (Integer peak : peaks) {
    float value = Float.valueOf(dataArray[peak]);
    Toast.makeText(getApplicationContext(), "Peak of height " + value + " found at index " + peak, Toast.LENGTH_SHORT).show();
}

For future reference, this section of code

if (y_0 > MP) {
    MP = (int) y_0;
} else {
    MP = (int) y_0;
}

Is equivalent to this:

MP = (int) y_0;

You assign MP = (int) y_0 regardless of whether the if statement is true or false.