please help me to fix error and rectify it to a correct programme

Question

Souvick roy 2019-4-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455487-please-help-me-to-fix-error-and-rectify-it-to-a-correct-programme

评论： Souvick roy 2019-4-11

gamma=0.02
lambda=[0.01:0.0045:0.1]
beta=0.01
m=lambda/gamma
y2=[0.02:0.049:1]
y1=[0.0:0.001:0.02]
y=[y1 y2]
p=y2./lambda
q=y1./lambda
s=beta./lambda
v1=1-exp(-q)
v2=beta*(y2-gamma)+1-exp(-p)+4*sqrt(beta)*(sqrt(exp(-1./m))-sqrt(exp(-y2./lambda)))
v=[v1 v2]
%a
plot(m,v)

errors are

Error using plot

Vectors must be the same lengths.

Error in mytryplugveloctylmbda (line 15)

plot(m,v)

2 个评论
显示无隐藏无

Alex Mcaulley 2019-4-10

编辑：Alex Mcaulley 2019-4-10

在 MATLAB Online 中打开

This is your problem:

length(m)
ans =
    21
>> length(v)
ans =
    42
    

What do you want to plot?

Probably is this:

plot(m,v1,m,v2)

Souvick roy 2019-4-11

actually velocity law are hare depends on distance from

v1 is valid from y=0 to y=delta as mentioned y1

v2 valid from y=delta to y=1 as mentioned y2

and velocity is comprised of both i.ev1 is valid from y=0 to y=delta and v2 valid from y=delta to y=1

i want to plot v againest m

请先登录，再进行评论。

请先登录，再回答此问题。

Answer 1

David Wilson 2019-4-10

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/455487-please-help-me-to-fix-error-and-rectify-it-to-a-correct-programme#answer_369942

编辑：David Wilson 2019-4-10

在 MATLAB Online 中打开

In general, it's better to use column vectors by default. That way you don't make mistakes like above when concatenating.

gamma=0.02
lambda=[0.01:0.0045:0.1]' % make a column vector 
beta=0.01
m=lambda/gamma
y2=[0.02:0.049:1]'
y1=[0.0:0.001:0.02]'
y=[y1, y2]
p=y2./lambda
q=y1./lambda
s=beta./lambda
v1=1-exp(-q)
v2=beta*(y2-gamma)+1-exp(-p)+4*sqrt(beta)*(sqrt(exp(-1./m))-sqrt(exp(-y2./lambda)))
v=[v1, v2] % check that this is two columns 
%a
plot(m,v)