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Error: The input character is not valid in MATLAB statements or expressions.

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Nugroho Permata Putra
评论： Steven Lord 2021-1-5
Hi, i have an error when i try to run this
t=-2:.1:5;
x=3*exp(0.4*t);
y=2*exp(-0.9*t);
plot(t,x,t,y,':');
legend('x(t)','y(t)')
i'm new to matlab, please help ASAP :( ps : i'm using matlab r2012b
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显示 4更早的评论
Nugroho Permata Putra
Nugroho Permata Putra 2016-3-2
i got the solution, it was t={Character: ASCII Code 2}-2:.1:5; so i need to erase the special char. Sorry my apologies

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采纳的回答

Jan
Jan 2016-3-2
编辑：Jan 2016-3-2
The error message seems to tell, that the equal character "=" is not valid. How strange. Perhaps it is the space behind the =, which is a backspace charcter '\b' ?!
The code looks okay. How did you insert it to the command window? Simply try to type it again.
What is in the line above? Perhaps a continuation '...' and you've added the ">>" manually? I admit, this is wild guessing.

更多回答（2 个）

Kaya Wydler Cunningham
编辑：Walter Roberson 2017-1-5
The input character is not valid in MATLAB statements or expressions.
Error in lv (line 11)
[t,y] = ode45(@lvfun,[0 200],[1 1]); % solve ODE system over
Unsure as to what this means?
  2 个评论
Steven Lord
Steven Lord 2017-1-5
One or more of the characters in that expression (or perhaps inside lvfun) should be underlined in red in the Editor. If it is, tell us which one it is; copy and paste it between the single quotes in the following command; and tell us what MATLAB displays when you execute that command.
double('')
My suspicion is that you copied and pasted the code from something (Microsoft Word® for instance) that tries to be "nice" with its formatting. [The most common culprit is the "smart quote".]
Jan
Jan 2017-1-5
@Kaya: Please do not post a new question in the section for answers, but open a new thread. Then post the complete error message. It seems like the most interesting part is missing.

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Ahmed Makhlas
Ahmed Makhlas 2021-1-4
j'ai une erreur au niveau de la fonction imhist quelq'un qui aide moi
img=imread('lena1.png');
subplot(1,2,1);
imshow(img)
img=rgb2gray(img);
subplot(1,2,2)
imhist(img) %???????????????????????????
Error: File: imhist.m Line: 1 Column: 1
The input character is not valid in MATLAB statements or expressions.
  1 个评论
Steven Lord
Steven Lord 2021-1-5
Ran in:
First, I want to check whether you're calling the imhist.m included in Image Processing Toolbox or you're calling an imhist.m that you created or downloaded. What does this command display?
which -all imhist
/MATLAB/toolbox/images/images/imhist.m /MATLAB/toolbox/images/images/@gpuArray/imhist.m % Shadowed gpuArray method
If you're using the imhist function from Image Processing Toolbox, I want to check that you haven't accidentally modified it. What does this command display?
dbtype 1:1 imhist.m
1 function [yout,x] = imhist(varargin)
Which release of Image Processing Toolbox are you using?
ver images
------------------------------------------------------------------------------------------------------ MATLAB Version: 9.9.0.1544872 (R2020b) Update 3 MATLAB License Number: Operating System: Linux 4.14.195-0414195-generic #202008260539 SMP Wed Aug 26 11:20:58 UTC 2020 x86_64 Java Version: Java 1.8.0_202-b08 with Oracle Corporation Java HotSpot(TM) 64-Bit Server VM mixed mode ------------------------------------------------------------------------------------------------------ Image Processing Toolbox Version 11.2 (R2020b)

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