I need to find slope of a curve

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Abhinav 2016-8-21

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https://ww2.mathworks.cn/matlabcentral/answers/300298-i-need-to-find-slope-of-a-curve

回答： simone martinelli 2016-9-28

Screen Shot 2016-08-20 at 23.54.53.png

I have this graph plotted from FFT data (in excel). I need to find the slope of the curve seperately. so one value for line A (positive slope) and line B (negative slope). Idea is to get a ratio from that and compare the ratio with other samples. Usually i would go to my teacher but he is on holiday and i need this done well before he comes back.Also i am a complete novice when it comes to matlab, so a slightly detailed explanation would be very helpful. Thanks in advance.

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Answer 1

simone martinelli 2016-9-28

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https://ww2.mathworks.cn/matlabcentral/answers/300298-i-need-to-find-slope-of-a-curve#answer_236466

在 MATLAB Online 中打开

numA = xlsread(filename,sheet,xlRange) insert the range depending od quantity of data value A
numB = xlsread(filename,sheet,xlRange) insert the range depending od quantity of data value B
slopeA=diff(numA);% slope between different object of vector A
slopeB=diff(numB);% slope between different object of vector B