# need help with basic speed time graph plot

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Ben Newton 2019 年 11 月 5 日
Commented: Rena Berman 2019 年 12 月 12 日
need to make a subplot for this speed equation over 0 to 8 seconds, but all i get is a blank graph. i think its because the graph is zoomed in on a specific area, any idea how to plot one that can be seen??
t = 0:0.05:8;
s = @(t)((0.0041*t^6) - (0.1383*t^5) + (1.6963*t^4) - (8.915*t^3) + (13.961*t^2) + (40.96*t))/2.237;
subplot(1,2,1)
plot(t,s(t))
title('speed vs time')
xlabel('time (Seconds)')
ylabel('speed (m/s)')
grid on;

#### 2 件のコメント

Stephen Cobeldick 2019 年 11 月 8 日
Original question:
need to make a subplot for this speed equation over 0 to 8 seconds, but all i get is a blank graph. i think its because the graph is zoomed in on a specific area, any idea how to plot one that can be seen??
t = 0:0.05:8;
s = @(t)((0.0041*t^6) - (0.1383*t^5) + (1.6963*t^4) - (8.915*t^3) + (13.961*t^2) + (40.96*t))/2.237;
subplot(1,2,1)
plot(t,s(t))
title('speed vs time')
xlabel('time (Seconds)')
ylabel('speed (m/s)')
grid on;
Rena Berman 2019 年 12 月 12 日

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### 採用された回答

Richard Brown 2019 年 11 月 5 日
Your function needs to have elementwise powers, i.e. use .^ instead of ^
It's trying to do matrix powers of the vector of time values, which doesn't make sense.

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