How to plot time against acceleration in my code?
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Hi! I'm new to Matlab and trying to understand the basics, but I've run into a problem. I have imported data from an excel sheet about the trajectory of a small marble, but when I try the plot acceleration (ax or ay) against the time (t), all values of ax and ay are plotted against one t value! I assume this problem emerges because I am using diff(vx) to differentiate my velocity functions... How can I change my code in order to plot these values against their corresponding ts? Thanks in advance!
x=xlsread('marble excel.xlsx','B2:B26');
y=xlsread('marble excel.xlsx','C2:C26');
t=xlsread('marble excel.xlsx','A2:A26');
vx=x/t;
vy=y/t;
ax=diff(vx);
ay=diff(vy);
plot(t,ax)
hold
plot(t,ay)
采纳的回答
Image Analyst
2015-2-22
编辑：Image Analyst
2015-2-22
You need an element-by-element divide, not a matrix divide:
vx = x ./ t;
vy = y ./ t;
plot(t(1:end-1),ax)
hold all;
plot(t(1:end-1),ay)
2 个评论
Skye Morrisson
2015-2-22
Image Analyst
2015-2-22
When you do diff(), you get a vector one shorter than what you started with.
更多回答（1 个）
Vinayak
2025-4-1
0 个投票
x=xlsread('marble excel.xlsx','B2:B26');
y=xlsread('marble excel.xlsx','C2:C26');
t=xlsread('marble excel.xlsx','A2:A26');
vx=x/t;
vy=y/t;
ax=diff(vx);
ay=diff(vy);
plot(t,ax)
hold
plot(t,ay)
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